承知済みのみに送信するようになっておりますでしょうか？

backend/app/Http/Controllers/Api/MeetingsController.php

@@ -815,8 +815,10 @@ class MeetingsController extends Controller {
             // 子供達を知らせます。
             if (null !== ($fr = FatherRelation::where('father_id', (int)session()->get('fathers')['id'])->get())) {
                 foreach ($fr as $f) {
-                    if (null !== ($child = Child::where('id', $f->child_id)->first())) {
-                        Mail::to($child->email)->send(new MeetingEditNotification(session()->get('fathers')['company'], (int)$meeting_id));
+                    if (null !== ($meeting = MeetingApprovals::where('meeting_id', (int)$meeting_id)->where('child_id', $f->child_id)->whereNotNull('approval_at')->first())) {
+                        if (null !== ($child = Child::where('id', $f->child_id)->first())) {
+                            Mail::to($child->email)->send(new MeetingEditNotification(session()->get('fathers')['company'], (int)$meeting_id));
+                        }
                     }
                 }
             }