[Nancy] loves her brother [Nicholas]. [Nancy] and her sister [Theresa] played golf together. [Nancy] won easily.
('Theresa', 'Nicholas')
[Nancy] and her sister [Theresa] played golf together. [Nancy] won easily. [Nancy] loves her brother [Nicholas].
[{('Theresa', 'brother', 'Nicholas'): [('Theresa', 'sister', 'Nancy'), ('Nancy', 'brother', 'Nicholas')]}]
['sister', 'brother']