[Amy] went to her son [Dennis]'s house but he was not home. His wife, [Emily] was though.
('Amy', 'Emily')
[Amy] went to her son [Dennis]'s house but he was not home. His wife, [Emily] was though.
[{('Amy', 'daughter-in-law', 'Emily'): [('Amy', 'son', 'Dennis'), ('Dennis', 'wife', 'Emily')]}]
['son', 'wife']