[George] and his brother [Nicholas] went to the boxing match. [Nancy] was upset her brother [George] did n't invite her.
('Nancy', 'Nicholas')
[George] and his brother [Nicholas] went to the boxing match. [Nancy] was upset her brother [George] did n't invite her.
[{('Nancy', 'brother', 'Nicholas'): [('Nancy', 'brother', 'George'), ('George', 'brother', 'Nicholas')]}]
['brother', 'brother']