[Nicholas] watched his daughter [Mary] playing basketball. [Mary] threw the ball to her brother [Michael] who made the basket.
('Nicholas', 'Michael')
[Nicholas] watched his daughter [Mary] playing basketball. [Mary] threw the ball to her brother [Michael] who made the basket.
[{('Nicholas', 'son', 'Michael'): [('Nicholas', 'daughter', 'Mary'), ('Mary', 'brother', 'Michael')]}]
['daughter', 'brother']