[Martha] and her mother [Mary] went to volunteer at the homeless shelter last weekend. [Mary] could n't wait to pick up her husband [Roy] at the airport.
('Roy', 'Martha')
[Mary] could n't wait to pick up her husband [Roy] at the airport. [Martha] and her mother [Mary] went to volunteer at the homeless shelter last weekend.
[{('Roy', 'daughter', 'Martha'): [('Roy', 'wife', 'Mary'), ('Mary', 'daughter', 'Martha')]}]