[Nicholas] and his brother [Dale] had a fight. They did n't speak to each other for a whole week afterwards. [Wayne] met his brother [Dale] for drinks after work.
('Wayne', 'Nicholas')
[Wayne] met his brother [Dale] for drinks after work. [Nicholas] and his brother [Dale] had a fight. They did n't speak to each other for a whole week afterwards.
[{('Wayne', 'brother', 'Nicholas'): [('Wayne', 'brother', 'Dale'), ('Dale', 'brother', 'Nicholas')]}]
['brother', 'brother']