def _family_id_to_superclass(self, family_id):
        """
        Temporary hardcoded mapping from serialized family id to either `class :XBlock:` or `:XBlockAside`
        """
        for family in [XBlock, XBlockAside]:
            if family_id == family.entry_point:
                return family
        raise ValueError('No such family: {}'.format(family_id))
Temporary hardcoded mapping from serialized family id to either `class :XBlock:` or `:XBlockAside`