[Amy] went with her daughter [Emily] to pick up [Emily]'s husband [Dennis] at the airport. His flight arrived early.
('Dennis', 'Amy')
[Amy] went with her daughter [Emily] to pick up [Emily]'s husband [Dennis] at the airport. His flight arrived early.
[{('Dennis', 'mother-in-law', 'Amy'): [('Dennis', 'wife', 'Emily'), ('Emily', 'mother', 'Amy')]}]
['wife', 'mother']