[James] and his brother [Tony] went fishing but [James] did n't invite his other brother [Travis].
('Travis', 'Tony')
[James] and his brother [Tony] went fishing but [James] did n't invite his other brother [Travis].
[{('Travis', 'brother', 'Tony'): [('Travis', 'brother', 'James'), ('James', 'brother', 'Tony')]}]
['brother', 'brother']