[George] wanted to go swimming with her brother, [Dale]. [Dale], however, was n't interested as he wanted to play soccer with his sister, [Nancy].
('George', 'Nancy')
[George] wanted to go swimming with her brother, [Dale]. [Dale], however, was n't interested as he wanted to play soccer with his sister, [Nancy].
[{('George', 'sister', 'Nancy'): [('George', 'brother', 'Dale'), ('Dale', 'sister', 'Nancy')]}]
['brother', 'sister']