Retuns whether the object is a child of the :obj:`Group` ``group``

def has_parent_group(self, group):
        """Retuns whether the object is a child of the :obj:`Group` ``group``"""
        if isinstance(group, str):
            return self._has_parent_group_by_name(group)

        else:
            return self._has_parent_group_by_object(group)