[Nicholas] and his son, [Dennis], came back from a long day's work. [Dennis]'s wife, [Emily], had a hot meal prepared and waiting for them.
('Nicholas', 'Emily')
[Nicholas] and his son, [Dennis], came back from a long day's work. [Dennis]'s wife, [Emily], had a hot meal prepared and waiting for them.
[{('Nicholas', 'daughter-in-law', 'Emily'): [('Nicholas', 'son', 'Dennis'), ('Dennis', 'wife', 'Emily')]}]
['son', 'wife']