[Milton] bought his wife [Mary] a new phone for her birthday. She loved it. [Milton] went to the park with his father, [Nicholas].
('Mary', 'Nicholas')
[Milton] bought his wife [Mary] a new phone for her birthday. She loved it. [Milton] went to the park with his father, [Nicholas].
[{('Mary', 'father-in-law', 'Nicholas'): [('Mary', 'husband', 'Milton'), ('Milton', 'father', 'Nicholas')]}]
['husband', 'father']