[Theresa] went to the basketball game with her brother [George], who brought along his son [John].
('Theresa', 'John')
[Theresa] went to the basketball game with her brother [George], who brought along his son [John].
[{('Theresa', 'nephew', 'John'): [('Theresa', 'brother', 'George'), ('George', 'son', 'John')]}]
['brother', 'son']