[Dennis] and his wife [Emily] decided to visit [Emily]'s mother [Amy] on Sunday.
('Dennis', 'Amy')
[Dennis] and his wife [Emily] decided to visit [Emily]'s mother [Amy] on Sunday.
[{('Dennis', 'mother-in-law', 'Amy'): [('Dennis', 'wife', 'Emily'), ('Emily', 'mother', 'Amy')]}]
['wife', 'mother']