def child_relationship_note(self, crid, nid):
        return self.child_base + crid + "/notes/" + nid
https://familysearch.org/developers/docs/api/tree/Child-and-Parents_Relationship_Note_resource
dataset/ETHPy150Open AmEv7Fam/familysearch-python-sdk-opensource/familysearch/parentsAndChildren.py/ParentsAndChildren.child_relationship_note