/**
  * Gets collection of siblings and parent for this make
  * @param DBModel $model
  * @return type
  */
 function get_related_models(DBModel $model)
 {
     $related_models = array();
     if ($model->is_parent()) {
         foreach (get_children_models($model) as $item) {
             $related_model[] = $item;
         }
     } else {
         foreach (get_sibling_models($model) as $item) {
             $related_models[] = $item;
         }
     }
     $related_models[] = get_parent_model($model);
     return $related_models;
 }