[Nicholas] liked playing with his brother [Dale] more than anyone else. This made [Nancy] jealous of her brother [Dale].
('Nancy', 'Nicholas')
[Nicholas] liked playing with his brother [Dale] more than anyone else. This made [Nancy] jealous of her brother [Dale].
[{('Nancy', 'brother', 'Nicholas'): [('Nancy', 'brother', 'Dale'), ('Dale', 'brother', 'Nicholas')]}]
['brother', 'brother']