[Nicholas]'s sister [Nancy] asked him to play cards with her, He did n't want to, he wanted to go ride bikes with his brother [Dale] instead.
('Dale', 'Nancy')
[Nicholas]'s sister [Nancy] asked him to play cards with her, He did n't want to, he wanted to go ride bikes with his brother [Dale] instead.
[{('Dale', 'sister', 'Nancy'): [('Dale', 'brother', 'Nicholas'), ('Nicholas', 'sister', 'Nancy')]}]
['brother', 'sister']