[Theresa] asked her sister [Nancy] to play with her. [Nancy] did n't want to, she wanted to play with her sister [Amy] instead.
('Theresa', 'Amy')
[Theresa] asked her sister [Nancy] to play with her. [Nancy] did n't want to, she wanted to play with her sister [Amy] instead.
[{('Theresa', 'sister', 'Amy'): [('Theresa', 'sister', 'Nancy'), ('Nancy', 'sister', 'Amy')]}]
['sister', 'sister']