[Nicholas] liked to play catch with his daughter [Mary]. [Mary] took her brother [Glen] to work Monday because his car was in the shop getting a tune up.
('Glen', 'Nicholas')
[Mary] took her brother [Glen] to work Monday because his car was in the shop getting a tune up. [Nicholas] liked to play catch with his daughter [Mary].
[{('Glen', 'father', 'Nicholas'): [('Glen', 'sister', 'Mary'), ('Mary', 'father', 'Nicholas')]}]
['sister', 'father']