[Dale] is a factory worker. He has a wonderful sister by the name of [Nancy]. [Amy] and her sister [Nancy] are the only children in their family.
('Dale', 'Amy')
[Dale] is a factory worker. He has a wonderful sister by the name of [Nancy]. [Amy] and her sister [Nancy] are the only children in their family.
[{('Dale', 'sister', 'Amy'): [('Dale', 'sister', 'Nancy'), ('Nancy', 'sister', 'Amy')]}]
['sister', 'sister']