def couple_change_history(self, crid, **kwargs):
        return self._add_query_params(
            self.tree_base + "couple-relationships/" + crid + "/changes",
            kwargs)
https://familysearch.org/developers/docs/api/tree/Couple_Relationship_Change_History_resource
dataset/ETHPy150Open AmEv7Fam/familysearch-python-sdk-opensource/familysearch/changeHistory.py/ChangeHistory.couple_change_history