diff --git a/app/Couple.php b/app/Couple.php
index 6427682..2908730 100644
--- a/app/Couple.php
+++ b/app/Couple.php
@@ -3,9 +3,17 @@
 namespace App;
 
 use Illuminate\Database\Eloquent\Model;
+use Ramsey\Uuid\Uuid;
 
 class Couple extends Model
 {
+    /**
+     * Indicates if the IDs are auto-incrementing.
+     *
+     * @var bool
+     */
+    public $incrementing = false;
+
     public function husband()
     {
         return $this->belongsTo(User::class);
@@ -23,6 +31,7 @@ class Couple extends Model
 
     public function addChild(User $user)
     {
+        $user->id = Uuid::uuid4()->toString();
         $user->parent_id = $this->id;
         $user->father_id = $this->husband_id;
         $user->mother_id = $this->wife_id;
diff --git a/app/CouplePivot.php b/app/CouplePivot.php
new file mode 100644
index 0000000..a190c09
--- /dev/null
+++ b/app/CouplePivot.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Relations\Pivot;
+
+class CouplePivot extends Pivot
+{
+    protected $casts = [
+        'id' => 'string',
+    ];
+}
diff --git a/app/Http/Controllers/Auth/RegisterController.php b/app/Http/Controllers/Auth/RegisterController.php
index dedef38..23a0551 100644
--- a/app/Http/Controllers/Auth/RegisterController.php
+++ b/app/Http/Controllers/Auth/RegisterController.php
@@ -2,10 +2,11 @@
 
 namespace App\Http\Controllers\Auth;
 
-use App\User;
 use App\Http\Controllers\Controller;
-use Illuminate\Support\Facades\Validator;
+use App\User;
 use Illuminate\Foundation\Auth\RegistersUsers;
+use Illuminate\Support\Facades\Validator;
+use Ramsey\Uuid\Uuid;
 
 class RegisterController extends Controller
 {
@@ -65,6 +66,7 @@ class RegisterController extends Controller
     protected function create(array $data)
     {
         $user = User::create([
+            'id' => Uuid::uuid4()->toString(),
             'nickname' => $data['nickname'],
             'name' => $data['name'],
             'gender_id' => $data['gender_id'],
diff --git a/app/Http/Controllers/FamilyActionsController.php b/app/Http/Controllers/FamilyActionsController.php
index 1e1dce5..037975e 100644
--- a/app/Http/Controllers/FamilyActionsController.php
+++ b/app/Http/Controllers/FamilyActionsController.php
@@ -5,6 +5,7 @@ namespace App\Http\Controllers;
 use App\Couple;
 use App\User;
 use Illuminate\Http\Request;
+use Ramsey\Uuid\Uuid;
 
 class FamilyActionsController extends Controller
 {
@@ -12,7 +13,7 @@ class FamilyActionsController extends Controller
     {
         $this->validate($request, [
             'set_father_id' => 'nullable',
-            'set_father' => 'required_without:set_father_id|max:255',
+            'set_father'    => 'required_without:set_father_id|max:255',
         ]);
 
         if ($request->get('set_father_id')) {
@@ -20,6 +21,7 @@ class FamilyActionsController extends Controller
             $user->save();
         } else {
             $father = new User;
+            $father->id = Uuid::uuid4()->toString();
             $father->name = $request->get('set_father');
             $father->nickname = $request->get('set_father');
             $father->gender_id = 1;
@@ -35,7 +37,7 @@ class FamilyActionsController extends Controller
     {
         $this->validate($request, [
             'set_mother_id' => 'nullable',
-            'set_mother' => 'required_without:set_mother_id|max:255',
+            'set_mother'    => 'required_without:set_mother_id|max:255',
         ]);
 
         if ($request->get('set_mother_id')) {
@@ -43,6 +45,7 @@ class FamilyActionsController extends Controller
             $user->save();
         } else {
             $mother = new User;
+            $mother->id = Uuid::uuid4()->toString();
             $mother->name = $request->get('set_mother');
             $mother->nickname = $request->get('set_mother');
             $mother->gender_id = 2;
@@ -57,12 +60,13 @@ class FamilyActionsController extends Controller
     public function addChild(Request $request, User $user)
     {
         $this->validate($request, [
-            'add_child_name' => 'required|string|max:255',
+            'add_child_name'      => 'required|string|max:255',
             'add_child_gender_id' => 'required|in:1,2',
             'add_child_parent_id' => 'nullable|exists:couples,id',
         ]);
 
         $child = new User;
+        $child->id = Uuid::uuid4()->toString();
         $child->name = $request->get('add_child_name');
         $child->nickname = $request->get('add_child_name');
         $child->gender_id = $request->get('add_child_gender_id');
@@ -78,10 +82,12 @@ class FamilyActionsController extends Controller
             $child->mother_id = $couple->wife_id;
             $child->save();
         } else {
-            if ($user->gender_id == 1)
+            if ($user->gender_id == 1) {
                 $child->setFather($user);
-            else
+            } else {
                 $child->setMother($user);
+            }
+
         }
 
         \DB::commit();
@@ -92,8 +98,8 @@ class FamilyActionsController extends Controller
     public function addWife(Request $request, User $user)
     {
         $this->validate($request, [
-            'set_wife_id' => 'nullable',
-            'set_wife' => 'required_without:set_wife_id|max:255',
+            'set_wife_id'   => 'nullable',
+            'set_wife'      => 'required_without:set_wife_id|max:255',
             'marriage_date' => 'nullable|date|date_format:Y-m-d',
         ]);
 
@@ -101,6 +107,7 @@ class FamilyActionsController extends Controller
             $wife = User::findOrFail($request->get('set_wife_id'));
         } else {
             $wife = new User;
+            $wife->id = Uuid::uuid4()->toString();
             $wife->name = $request->get('set_wife');
             $wife->nickname = $request->get('set_wife');
             $wife->gender_id = 2;
@@ -116,14 +123,15 @@ class FamilyActionsController extends Controller
     {
         $this->validate($request, [
             'set_husband_id' => 'nullable',
-            'set_husband' => 'required_without:set_husband_id|max:255',
-            'marriage_date' => 'nullable|date|date_format:Y-m-d',
+            'set_husband'    => 'required_without:set_husband_id|max:255',
+            'marriage_date'  => 'nullable|date|date_format:Y-m-d',
         ]);
 
         if ($request->get('set_husband_id')) {
             $husband = User::findOrFail($request->get('set_husband_id'));
         } else {
             $husband = new User;
+            $husband->id = Uuid::uuid4()->toString();
             $husband->name = $request->get('set_husband');
             $husband->nickname = $request->get('set_husband');
             $husband->gender_id = 1;
diff --git a/app/User.php b/app/User.php
index 362ca85..8255803 100644
--- a/app/User.php
+++ b/app/User.php
@@ -2,19 +2,28 @@
 
 namespace App;
 
-use Illuminate\Notifications\Notifiable;
 use Illuminate\Foundation\Auth\User as Authenticatable;
+use Illuminate\Notifications\Notifiable;
+use Ramsey\Uuid\Uuid;
 
 class User extends Authenticatable
 {
     use Notifiable;
 
     /**
+     * Indicates if the IDs are auto-incrementing.
+     *
+     * @var bool
+     */
+    public $incrementing = false;
+
+    /**
      * The attributes that are mass assignable.
      *
      * @var array
      */
     protected $fillable = [
+        'id',
         'nickname', 'gender_id', 'name',
         'email', 'password',
         'address', 'phone',
@@ -35,6 +44,14 @@ class User extends Authenticatable
         'gender',
     ];
 
+    protected $casts = [
+        'couples.pivot.id'  => 'string',
+        'wifes.pivot.id'    => 'string',
+        'husbands.pivot.id' => 'string',
+    ];
+
+    // protected $keyType = 'string';
+
     public function getGenderAttribute()
     {
         return $this->gender_id == 1 ? trans('app.male_code') : trans('app.female_code');
@@ -44,8 +61,9 @@ class User extends Authenticatable
     {
         if ($father->gender_id == 1) {
 
-            if ($father->exists == false)
+            if ($father->exists == false) {
                 $father->save();
+            }
 
             $this->father_id = $father->id;
             $this->save();
@@ -60,8 +78,9 @@ class User extends Authenticatable
     {
         if ($mother->gender_id == 2) {
 
-            if ($mother->exists == false)
+            if ($mother->exists == false) {
                 $mother->save();
+            }
 
             $this->mother_id = $mother->id;
             $this->save();
@@ -84,8 +103,9 @@ class User extends Authenticatable
 
     public function childs()
     {
-        if ($this->gender_id == 2)
+        if ($this->gender_id == 2) {
             return $this->hasMany(User::class, 'mother_id');
+        }
 
         return $this->hasMany(User::class, 'father_id');
     }
@@ -108,13 +128,16 @@ class User extends Authenticatable
 
     public function wifes()
     {
-        return $this->belongsToMany(User::class, 'couples', 'husband_id', 'wife_id')->withPivot(['id'])->withTimestamps();
+        return $this->belongsToMany(User::class, 'couples', 'husband_id', 'wife_id')->using('App\CouplePivot')->withPivot(['id'])->withTimestamps();
     }
 
     public function addWife(User $wife, $marriageDate = null)
     {
-        if ($this->gender_id == 1 && ! $this->hasBeenMarriedTo($wife)) {
-            $this->wifes()->save($wife, ['marriage_date' => $marriageDate]);
+        if ($this->gender_id == 1 && !$this->hasBeenMarriedTo($wife)) {
+            $this->wifes()->save($wife, [
+                'id'            => Uuid::uuid4()->toString(),
+                'marriage_date' => $marriageDate,
+            ]);
             return $wife;
         }
 
@@ -123,13 +146,16 @@ class User extends Authenticatable
 
     public function husbands()
     {
-        return $this->belongsToMany(User::class, 'couples', 'wife_id', 'husband_id')->withPivot(['id'])->withTimestamps();
+        return $this->belongsToMany(User::class, 'couples', 'wife_id', 'husband_id')->using('App\CouplePivot')->withPivot(['id'])->withTimestamps();
     }
 
     public function addHusband(User $husband, $marriageDate = null)
     {
-        if ($this->gender_id == 2 && ! $this->hasBeenMarriedTo($husband)) {
-            $this->husbands()->save($husband, ['marriage_date' => $marriageDate]);
+        if ($this->gender_id == 2 && !$this->hasBeenMarriedTo($husband)) {
+            $this->husbands()->save($husband, [
+                'id'            => Uuid::uuid4()->toString(),
+                'marriage_date' => $marriageDate,
+            ]);
             return $husband;
         }
 
@@ -143,33 +169,42 @@ class User extends Authenticatable
 
     public function couples()
     {
-        if ($this->gender_id == 1)
-            return $this->belongsToMany(User::class, 'couples', 'husband_id', 'wife_id')->withPivot(['id'])->withTimestamps();
+        if ($this->gender_id == 1) {
+            return $this->belongsToMany(User::class, 'couples', 'husband_id', 'wife_id')->using('App\CouplePivot')->withPivot(['id'])->withTimestamps();
+        }
 
-        return $this->belongsToMany(User::class, 'couples', 'wife_id', 'husband_id')->withPivot(['id'])->withTimestamps();
+        return $this->belongsToMany(User::class, 'couples', 'wife_id', 'husband_id')->using('App\CouplePivot')->withPivot(['id'])->withTimestamps();
     }
 
     public function marriages()
     {
-        if ($this->gender_id == 1)
+        if ($this->gender_id == 1) {
             return $this->hasMany(Couple::class, 'husband_id');
+        }
 
         return $this->hasMany(Couple::class, 'wife_id');
     }
 
     public function siblings()
     {
-        if (is_null($this->father_id) && is_null($this->mother_id) && is_null($this->parent_id))
+        if (is_null($this->father_id) && is_null($this->mother_id) && is_null($this->parent_id)) {
             return collect([]);
+        }
 
         return User::where('id', '!=', $this->id)
             ->where(function ($query) {
-                if (!is_null($this->father_id))
+                if (!is_null($this->father_id)) {
                     $query->where('father_id', $this->father_id);
-                if (!is_null($this->mother_id))
+                }
+
+                if (!is_null($this->mother_id)) {
                     $query->orWhere('mother_id', $this->mother_id);
-                if (!is_null($this->parent_id))
+                }
+
+                if (!is_null($this->parent_id)) {
                     $query->orWhere('parent_id', $this->parent_id);
+                }
+
             })
             ->get();
     }
diff --git a/database/factories/ModelFactory.php b/database/factories/ModelFactory.php
index 1ce8110..4e2bf11 100644
--- a/database/factories/ModelFactory.php
+++ b/database/factories/ModelFactory.php
@@ -18,10 +18,11 @@ use App\User;
 $factory->define(User::class, function (Faker\Generator $faker) {
     $name = $faker->name;
     return [
+        'id' => $faker->uuid,
         'name' => $name,
         'nickname' => $name,
         'gender_id' => rand(1, 2),
-        'manager_id' => 1,
+        'manager_id' => $faker->uuid,
     ];
 });
 
@@ -34,8 +35,8 @@ $factory->state(User::class, 'female', function (Faker\Generator $faker) {
 });
 
 $factory->define(Couple::class, function (Faker\Generator $faker) {
-    $name = $faker->name;
     return [
+        'id' => $faker->uuid,
         'husband_id' => function () {
             return factory(User::class)->states('male')->create()->id;
         },
diff --git a/database/migrations/2014_10_12_000000_create_users_table.php b/database/migrations/2014_10_12_000000_create_users_table.php
index b102aae..a0e407c 100644
--- a/database/migrations/2014_10_12_000000_create_users_table.php
+++ b/database/migrations/2014_10_12_000000_create_users_table.php
@@ -14,13 +14,13 @@ class CreateUsersTable extends Migration
     public function up()
     {
         Schema::create('users', function (Blueprint $table) {
-            $table->increments('id');
+            $table->uuid('id')->primary();
             $table->string('nickname');
             $table->string('name')->nullable();
             $table->boolean('gender_id')->unsigned();
-            $table->unsignedInteger('father_id')->nullable();
-            $table->unsignedInteger('mother_id')->nullable();
-            $table->unsignedInteger('parent_id')->nullable();
+            $table->uuid('father_id')->nullable();
+            $table->uuid('mother_id')->nullable();
+            $table->uuid('parent_id')->nullable();
             $table->date('dob')->nullable();
             $table->date('dod')->nullable();
             $table->date('yod')->nullable();
@@ -30,7 +30,7 @@ class CreateUsersTable extends Migration
             $table->string('city')->nullable();
             $table->string('phone')->nullable();
             $table->string('photo_path')->nullable();
-            $table->unsignedInteger('manager_id')->nullable();
+            $table->uuid('manager_id')->nullable();
             $table->rememberToken();
             $table->timestamps();
         });
diff --git a/database/migrations/2017_06_27_151536_create_couples_table.php b/database/migrations/2017_06_27_151536_create_couples_table.php
index db733f1..5acafcb 100644
--- a/database/migrations/2017_06_27_151536_create_couples_table.php
+++ b/database/migrations/2017_06_27_151536_create_couples_table.php
@@ -14,12 +14,12 @@ class CreateCouplesTable extends Migration
     public function up()
     {
         Schema::create('couples', function (Blueprint $table) {
-            $table->increments('id');
-            $table->unsignedInteger('husband_id');
-            $table->unsignedInteger('wife_id');
+            $table->uuid('id')->primary();
+            $table->uuid('husband_id');
+            $table->uuid('wife_id');
             $table->date('marriage_date')->nullable();
             $table->date('divorce_date')->nullable();
-            $table->unsignedInteger('manager_id')->nullable();
+            $table->uuid('manager_id')->nullable();
             $table->timestamps();
 
             $table->unique(['husband_id', 'wife_id']);
diff --git a/tests/Feature/ManageUserFamiliesTest.php b/tests/Feature/ManageUserFamiliesTest.php
index 6d4db9a..506a214 100644
--- a/tests/Feature/ManageUserFamiliesTest.php
+++ b/tests/Feature/ManageUserFamiliesTest.php
@@ -48,7 +48,7 @@ class ManageUserFamiliesTest extends TestCase
         ]);
 
         $this->seeInDatabase('users', [
-            'nickname' => 'Nama Ibu',
+            'nickname'   => 'Nama Ibu',
             'manager_id' => $user->id,
         ]);
 
@@ -67,17 +67,17 @@ class ManageUserFamiliesTest extends TestCase
         $this->seeElement('select', ['name' => 'add_child_parent_id']);
 
         $this->submitForm(trans('user.add_child'), [
-            'add_child_name' => 'Nama Anak 1',
+            'add_child_name'      => 'Nama Anak 1',
             'add_child_gender_id' => 1,
             'add_child_parent_id' => '',
         ]);
 
         $this->seeInDatabase('users', [
-            'nickname' => 'Nama Anak 1',
-            'gender_id' => 1,
-            'father_id' => $user->id,
-            'mother_id' => null,
-            'parent_id' => null,
+            'nickname'   => 'Nama Anak 1',
+            'gender_id'  => 1,
+            'father_id'  => $user->id,
+            'mother_id'  => null,
+            'parent_id'  => null,
             'manager_id' => $user->id,
         ]);
     }
@@ -85,12 +85,11 @@ class ManageUserFamiliesTest extends TestCase
     /** @test */
     public function user_can_add_childrens_with_parent_id_if_exist()
     {
-        $husband = factory(User::class)->states('male')->create();
-        $wife = factory(User::class)->states('female')->create();
+        $husband = $this->loginAsUser(['gender_id' => 1]);
+        $wife = factory(User::class)->states('female')->create(['manager_id' => $husband->id]);
         $husband->addWife($wife);
 
         $marriageId = $husband->fresh()->wifes->first()->pivot->id;
-        $this->actingAs($husband);
 
         $this->visit(route('profile'));
         $this->seePageIs(route('profile'));
@@ -100,16 +99,16 @@ class ManageUserFamiliesTest extends TestCase
         $this->seeElement('select', ['name' => 'add_child_parent_id']);
 
         $this->submitForm(trans('user.add_child'), [
-            'add_child_name' => 'Nama Anak 1',
+            'add_child_name'      => 'Nama Anak 1',
             'add_child_gender_id' => 1,
             'add_child_parent_id' => $marriageId,
         ]);
 
         $this->seeInDatabase('users', [
-            'nickname' => 'Nama Anak 1',
-            'gender_id' => 1,
-            'father_id' => $husband->id,
-            'mother_id' => $wife->id,
+            'nickname'   => 'Nama Anak 1',
+            'gender_id'  => 1,
+            'father_id'  => $husband->id,
+            'mother_id'  => $wife->id,
             'manager_id' => $husband->id,
         ]);
     }
@@ -124,20 +123,23 @@ class ManageUserFamiliesTest extends TestCase
         $this->seeElement('input', ['name' => 'set_wife']);
 
         $this->submitForm('set_wife_button', [
-            'set_wife' => 'Nama Istri',
+            'set_wife'      => 'Nama Istri',
             'marriage_date' => '2010-01-01',
         ]);
 
         $this->seeInDatabase('users', [
-            'nickname' => 'Nama Istri',
+            'nickname'  => 'Nama Istri',
             'gender_id' => 2,
         ]);
 
-        $wife = User::orderBy('id', 'desc')->first();
+        $wife = User::where([
+            'nickname'  => 'Nama Istri',
+            'gender_id' => 2,
+        ])->first();
 
         $this->seeInDatabase('couples', [
-            'husband_id' => $user->id,
-            'wife_id' => $wife->id,
+            'husband_id'    => $user->id,
+            'wife_id'       => $wife->id,
             'marriage_date' => '2010-01-01',
         ]);
     }
@@ -152,21 +154,24 @@ class ManageUserFamiliesTest extends TestCase
         $this->seeElement('input', ['name' => 'set_husband']);
 
         $this->submitForm('set_husband_button', [
-            'set_husband' => 'Nama Suami',
+            'set_husband'   => 'Nama Suami',
             'marriage_date' => '2010-03-03',
         ]);
 
         $this->seeInDatabase('users', [
-            'nickname' => 'Nama Suami',
-            'gender_id' => 1,
+            'nickname'   => 'Nama Suami',
+            'gender_id'  => 1,
             'manager_id' => $user->id,
         ]);
 
-        $husband = User::orderBy('id', 'desc')->first();
+        $husband = User::where([
+            'nickname'  => 'Nama Suami',
+            'gender_id' => 1,
+        ])->first();
 
         $this->seeInDatabase('couples', [
-            'husband_id' => $husband->id,
-            'wife_id' => $user->id,
+            'husband_id'    => $husband->id,
+            'wife_id'       => $user->id,
             'marriage_date' => '2010-03-03',
         ]);
     }
@@ -186,7 +191,7 @@ class ManageUserFamiliesTest extends TestCase
         $this->seeElement('select', ['name' => 'set_father_id']);
 
         $this->submitForm('set_father_button', [
-            'set_father' => '',
+            'set_father'    => '',
             'set_father_id' => $father->id,
         ]);
 
@@ -208,7 +213,7 @@ class ManageUserFamiliesTest extends TestCase
         $this->seeElement('select', ['name' => 'set_mother_id']);
 
         $this->submitForm('set_mother_button', [
-            'set_mother' => '',
+            'set_mother'    => '',
             'set_mother_id' => $mother->id,
         ]);
 
@@ -228,14 +233,14 @@ class ManageUserFamiliesTest extends TestCase
         $this->seeElement('select', ['name' => 'set_wife_id']);
 
         $this->submitForm('set_wife_button', [
-            'set_wife' => '',
-            'set_wife_id' => $wife->id,
+            'set_wife'      => '',
+            'set_wife_id'   => $wife->id,
             'marriage_date' => '2010-01-01',
         ]);
 
         $this->seeInDatabase('couples', [
-            'husband_id' => $user->id,
-            'wife_id' => $wife->id,
+            'husband_id'    => $user->id,
+            'wife_id'       => $wife->id,
             'marriage_date' => '2010-01-01',
         ]);
     }
@@ -253,14 +258,14 @@ class ManageUserFamiliesTest extends TestCase
         $this->seeElement('select', ['name' => 'set_husband_id']);
 
         $this->submitForm('set_husband_button', [
-            'set_husband' => '',
+            'set_husband'    => '',
             'set_husband_id' => $husband->id,
-            'marriage_date' => '2010-03-03',
+            'marriage_date'  => '2010-03-03',
         ]);
 
         $this->seeInDatabase('couples', [
-            'husband_id' => $husband->id,
-            'wife_id' => $user->id,
+            'husband_id'    => $husband->id,
+            'wife_id'       => $user->id,
             'marriage_date' => '2010-03-03',
         ]);
     }
@@ -284,8 +289,8 @@ class ManageUserFamiliesTest extends TestCase
         ]);
 
         $this->seeInDatabase('users', [
-            'id' => $user->id,
-            'parent_id' => $marriageId,
+            'id'         => $user->id,
+            'parent_id'  => $marriageId,
             'manager_id' => $user->id,
         ]);
     }
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 15a2c3a..4af3bfe 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -14,6 +14,12 @@ abstract class TestCase extends BaseTestCase
 
     protected function loginAsUser($overrides = [])
     {
+        $userId = \Ramsey\Uuid\Uuid::uuid4()->toString();
+        $overrides = array_merge([
+            'id' => $userId,
+            'manager_id' => $userId,
+        ], $overrides);
+
         $user = factory(User::class)->create($overrides);
         $this->actingAs($user);
 
diff --git a/tests/Unit/Policies/UserPolicyTest.php b/tests/Unit/Policies/UserPolicyTest.php
index 8a92d5e..8a1c3f8 100644
--- a/tests/Unit/Policies/UserPolicyTest.php
+++ b/tests/Unit/Policies/UserPolicyTest.php
@@ -13,8 +13,8 @@ class UserPolicyTest extends TestCase
     /** @test */
     public function admin_can_edit_users_profile()
     {
-        $user = factory(User::class)->create();
-        $manager = $user->manager;
+        $manager = factory(User::class)->create();
+        $user = factory(User::class)->create(['manager_id' => $manager->id]);
 
         $this->assertTrue($manager->can('edit', $user));
     }
diff --git a/tests/Unit/UserTest.php b/tests/Unit/UserTest.php
index 5585b97..bd441d4 100644
--- a/tests/Unit/UserTest.php
+++ b/tests/Unit/UserTest.php
@@ -76,7 +76,9 @@ class UserTest extends TestCase
     /** @test */
     public function a_user_have_a_manager()
     {
-        $user = factory(User::class)->create();
+        $manager = factory(User::class)->create();
+        $user = factory(User::class)->create(['manager_id' => $manager->id]);
+
         $this->assertTrue($user->manager instanceof User);
     }
 }