[Robert] and his son [Ronald] went to the park to look for different kinds of birds. [Harold] took his grandson [Ronald] to the waterpark for the first time ever. He had a great time. [Robert] watched his daughter [Angelica] playing basketball. [Angelica] threw the ball to her brother [Allan] who made the basket.
('Harold', 'Allan')
[Harold] took his grandson [Ronald] to the waterpark for the first time ever. He had a great time. [Robert] and his son [Ronald] went to the park to look for different kinds of birds. [Robert] watched his daughter [Angelica] playing basketball. [Angelica] threw the ball to her brother [Allan] who made the basket.
[{('Harold', 'grandson', 'Allan'): [('Harold', 'grandson', 'Ronald'), ('Ronald', 'brother', 'Allan')]}, {('Ronald', 'brother', 'Allan'): [('Ronald', 'father', 'Robert'), ('Robert', 'son', 'Allan')]}, {('Robert', 'son', 'Allan'): [('Robert', 'daughter', 'Angelica'), ('Angelica', 'brother', 'Allan')]}]
['grandson', 'father', 'daughter', 'brother']