[Amy] asked her brother, [Dale], what he was doing this weekend. [Dale] told her he was spending it with his brother [George].
('Amy', 'George')
[Amy] asked her brother, [Dale], what he was doing this weekend. [Dale] told her he was spending it with his brother [George].
[{('Amy', 'brother', 'George'): [('Amy', 'brother', 'Dale'), ('Dale', 'brother', 'George')]}]
['brother', 'brother']