Laravel query delete relationships

My model is Patient -> Sample , I delete a patient , I query deleted patient by withTrashed(), But don't query sample for deleted patient by withTrashed();

Patient_Controller

class Patient_Controller extends Controller{

public function query(Request $request){

    $result = Patient_Model::withTrashed();
        ->orderBy("updated_at","desc")
        ->Paginate(15)
        ->toJson();

   return $result;
}

But in Sample_Controller

class Sample_Controller extends Controller{

public function query(Request $request){

    $result = Sample_Model::with(['relationship_belong'])
        ->withTrashed()
        ->orderBy("updated_at","desc")
        ->Paginate(15)
        ->toJson();

   return $result;
}

But with not find delete Patient ,so My sample don't get patient info

via Chebli Mohamed