code: public function childStore($idParent, FilterRequest $filters, $relation)
      {        
          $idParent = $this->getRealId($idParent);
          
          $resource = $this->repository->storeChild($idParent, $relation, $filters->all());
          
          if (! $resource) {
              // return $this->notFound();
          }
          
          return $this->success($resource);
      }
docs: Create a new child
  
  @return \Illuminate\Http\Response