[Wesley] bought a book for his son [Chris]. [Tina] went to the park with her sister [Pamela]. [Pamela] decided not to invite her brother, [Chris], though.
('Tina', 'Wesley')
[Tina] went to the park with her sister [Pamela]. [Pamela] decided not to invite her brother, [Chris], though. [Wesley] bought a book for his son [Chris].
[{('Tina', 'father', 'Wesley'): [('Tina', 'sister', 'Pamela'), ('Pamela', 'father', 'Wesley')]}, {('Pamela', 'father', 'Wesley'): [('Pamela', 'brother', 'Chris'), ('Chris', 'father', 'Wesley')]}]
['sister', 'brother', 'father']