diff --git a/backend/app/Http/Controllers/Api/ChildrenController.php b/backend/app/Http/Controllers/Api/ChildrenController.php
index 06cbf928..0809961d 100644
--- a/backend/app/Http/Controllers/Api/ChildrenController.php
+++ b/backend/app/Http/Controllers/Api/ChildrenController.php
@@ -274,7 +274,7 @@ class ChildrenController extends Controller {
             return ['status_code' => 400, 'error_messages' => ['画像の更新に失敗しました。']];
         }
 
-        if (null === ($result = Child::where('first_name', 'LIKE', '%'.$r->keyword.'%')->orWhere('last_name', 'LIKE', '%'.$r->keyword.'%')->orderBy('created_at', 'desc')->get())) {
+        if (null === ($result = Child::where('first_name', 'LIKE', '%'.$r->keyword.'%')->orWhere('last_name', 'LIKE', '%'.$r->keyword.'%')->orderBy('updated_at', 'desc')->get())) {
             // 親一覧の取得に失敗
             return ['status_code' => 400];
         }
@@ -286,7 +286,7 @@ class ChildrenController extends Controller {
     public function list () {
         $child_select = ['id', 'first_name', 'last_name', 'tel', 'image'];
 
-        if (null === ($result = Child::select($child_select)->orderBy('created_at', 'desc')->get())) {
+        if (null === ($result = Child::select($child_select)->orderBy('updated_at', 'desc')->get())) {
             // 親一覧の取得に失敗
             return ['status_code' => 400];
         }
@@ -302,7 +302,7 @@ class ChildrenController extends Controller {
         $result = [];
         $child_select = ['id', 'image', 'first_name', 'last_name', 'company', 'tel', 'email'];
 
-        if (null === ($list = FatherRelation::select('child_id')->where('father_id', (int)$r->father_id)->orderBy('created_at', 'desc')->get())) {
+        if (null === ($list = FatherRelation::select('child_id')->where('father_id', (int)$r->father_id)->orderBy('updated_at', 'desc')->get())) {
             return ['status_code' => 400];
         }
 
@@ -319,7 +319,7 @@ class ChildrenController extends Controller {
         $result = [];
         $child_select = ['id', 'image', 'last_name', 'first_name'];
 
-        if (null === ($list = MeetingApprovals::select('child_id')->where('meeting_id', (int)$r->meeting_id)->orderBy('created_at', 'desc')->get())) {
+        if (null === ($list = MeetingApprovals::select('child_id')->where('meeting_id', (int)$r->meeting_id)->orderBy('updated_at', 'desc')->get())) {
             return ['status_code' => 400];
         }
 
@@ -341,7 +341,7 @@ class ChildrenController extends Controller {
         $child_select = ['id', 'image', 'last_name', 'first_name', 'tel'];
         $meeting_approvals_select = ['approval_at'];
 
-        if (null === ($list = MeetingApprovals::select($meeting_approvals_select)->where('meeting_id', (int)$r->meeting_id)->whereNull('approval_at')->orderBy('created_at', 'desc')->get())) {
+        if (null === ($list = MeetingApprovals::select($meeting_approvals_select)->where('meeting_id', (int)$r->meeting_id)->whereNull('approval_at')->orderBy('updated_at', 'desc')->get())) {
             return ['status_code' => 400];
         }
 
@@ -364,7 +364,7 @@ class ChildrenController extends Controller {
         $child_select = ['id', 'image', 'last_name', 'first_name', 'tel'];
         $meeting_approvals_select = ['approval_at'];
 
-        if (null === ($list = MeetingApprovals::select($meeting_approvals_select)->where('meeting_id', $r->meeting_id)->whereNotNull('approval_at')->orderBy('created_at', 'desc')->get())) {
+        if (null === ($list = MeetingApprovals::select($meeting_approvals_select)->where('meeting_id', $r->meeting_id)->whereNotNull('approval_at')->orderBy('updated_at', 'desc')->get())) {
             return ['status_code' => 400];
         }
 
diff --git a/backend/app/Http/Controllers/Api/FatherRelationsController.php b/backend/app/Http/Controllers/Api/FatherRelationsController.php
index af0e2399..e40da154 100644
--- a/backend/app/Http/Controllers/Api/FatherRelationsController.php
+++ b/backend/app/Http/Controllers/Api/FatherRelationsController.php
@@ -15,17 +15,18 @@ use App\Models\Meeting;
 use App\Models\MeetingApprovals;
 
 class FatherRelationsController extends Controller {
-    public function check (Request $r) {
-        
-        $father_id = (int)$r->father_id;
-        
-        if (FatherRelation::select('id')->where('father_id', $father_id)->count() == 0) {
+    public function checkNull () {
+        if (FatherRelation::select('id')->where('father_id', (int)session()->get('fathers')['id'])->count() == 0) {
             return ['status_code' => 401, 'error_messages' => ['契約上限数に達した為、メンバー追加できません。']];
         }
 
-        $father = Father::select('relation_limit')->where('id', $father_id)->first();
+        return ['status_code' => 200];
+    }
 
-        if ($father->relation_limit <= FatherRelation::select('id')->where('father_id', $father_id)->count()) {
+    public function check () {
+        $father = Father::select('relation_limit')->where('id', (int)session()->get('fathers')['id'])->first();
+
+        if ($father->relation_limit <= FatherRelation::select('id')->where('father_id', (int)session()->get('fathers')['id'])->count()) {
             return ['status_code' => 401, 'error_messages' => ['契約上限数に達した為、メンバー追加できません。']];
         }
 
diff --git a/backend/app/Http/Controllers/Api/MeetingsController.php b/backend/app/Http/Controllers/Api/MeetingsController.php
index 81b0b120..754ba081 100644
--- a/backend/app/Http/Controllers/Api/MeetingsController.php
+++ b/backend/app/Http/Controllers/Api/MeetingsController.php
@@ -447,7 +447,7 @@ class MeetingsController extends Controller {
         $child_select = ['image'];
 
         // 取得に成功
-        if (null === ($list = Meeting::select($meeting_select)->where('father_id', (int)session()->get('fathers')['id'])->where('is_favorite', 0)->orderBy('created_at', 'desc')->get())) {
+        if (null === ($list = Meeting::select($meeting_select)->where('father_id', (int)session()->get('fathers')['id'])->where('is_favorite', 0)->orderBy('updated_at', 'desc')->get())) {
             return ['status_code' => 400];
         }
 
diff --git a/backend/app/Models/TelActivation.php b/backend/app/Models/TelActivation.php
index 24b517dd..3902d68e 100644
--- a/backend/app/Models/TelActivation.php
+++ b/backend/app/Models/TelActivation.php
@@ -8,5 +8,5 @@ use Illuminate\Database\Eloquent\Model;
 class TelActivation extends Model
 {
     use HasFactory;
-    protected $fillable = ['type', 'child_id', 'father_id', 'tel', 'token', 'ttl'];
+    protected $fillable = ['type', 'child_id', 'tel', 'token', 'ttl'];
 }
diff --git a/backend/database/migrations/2021_08_13_050204_create_tel_activations_table.php b/backend/database/migrations/2021_08_13_050204_create_tel_activations_table.php
index 2c7fa5ca..6428ca31 100644
--- a/backend/database/migrations/2021_08_13_050204_create_tel_activations_table.php
+++ b/backend/database/migrations/2021_08_13_050204_create_tel_activations_table.php
@@ -18,8 +18,6 @@ class CreateTelActivationsTable extends Migration
             $table->unsignedTinyInteger('type');
             $table->unsignedBigInteger('child_id')->nullable();
             $table->foreign('child_id')->references('id')->on('children')->onDelete('cascade');
-            $table->unsignedBigInteger('father_id')->nullable();
-            $table->foreign('father_id')->references('id')->on('fathers')->onDelete('cascade');
             $table->string('tel', 11)->unique();
             $table->string('token', 100)->unique();
             $table->dateTime('ttl');
diff --git a/backend/routes/api.php b/backend/routes/api.php
index d0dd39f7..5bf34612 100644
--- a/backend/routes/api.php
+++ b/backend/routes/api.php
@@ -143,6 +143,7 @@ Route::group(['prefix' => 'fathers'], function () {
 
         // FatherRelationsController
         Route::group(['prefix' => 'relations'], function () {
+            Route::get('/checkNull', '\App\Http\Controllers\Api\FatherRelationsController@checkNull');
             Route::get('/check', '\App\Http\Controllers\Api\FatherRelationsController@check');
             Route::post('/register', '\App\Http\Controllers\Api\FatherRelationsController@register');
             Route::put('/updateHireDate/{child_id}', '\App\Http\Controllers\Api\FatherRelationsController@updateHireDate');