[Travis] and his sister [June] are going for a walk. [June] is taking a trip to see her sister [Charlotte].
('Travis', 'Charlotte')
[Travis] and his sister [June] are going for a walk. [June] is taking a trip to see her sister [Charlotte].
[{('Travis', 'sister', 'Charlotte'): [('Travis', 'sister', 'June'), ('June', 'sister', 'Charlotte')]}]
['sister', 'sister']