code: def siblings(self, **kwargs):
          # type: (Any) -> Any
          
          if self.parent_id:
              return self._client.parts(parent=self.parent_id, category=self.category, **kwargs)
          else:
              from pykechain.models.partset import PartSet
              return PartSet(parts=[])
docs: Retrieve the siblings of this `Part` as `Partset`.
  
          Siblings are other Parts sharing the same parent of this `Part`, including the part itself.
  
          :param kwargs: Additional search arguments to search for, check :class:`pykechain.Client.parts`
                         for additional info
          :type kwargs: dict
          :return: a set of `Parts` as a :class:`PartSet`. Will be empty if no siblings.
          :raises APIError: When an error occurs.