[Amy] was playing in the sandbox with her brother [George]. [Theresa] could n't wait for the surprise birthday party that she was throwing for her brother [George] next weekend.
('Amy', 'Theresa')
[Amy] was playing in the sandbox with her brother [George]. [Theresa] could n't wait for the surprise birthday party that she was throwing for her brother [George] next weekend.
[{('Amy', 'sister', 'Theresa'): [('Amy', 'brother', 'George'), ('George', 'sister', 'Theresa')]}]
['brother', 'sister']