[Mary] and her daughter [Martha] went out to dinner. [Roy] and his wife [Mary] got married in Spain.
('Roy', 'Martha')
[Roy] and his wife [Mary] got married in Spain. [Mary] and her daughter [Martha] went out to dinner.
[{('Roy', 'daughter', 'Martha'): [('Roy', 'wife', 'Mary'), ('Mary', 'daughter', 'Martha')]}]