[George] bought a book for his son [Timothy]. [Timothy] and his sister [Janet] went to brunch today at the new diner.
('Janet', 'George')
[Timothy] and his sister [Janet] went to brunch today at the new diner. [George] bought a book for his son [Timothy].
[{('Janet', 'father', 'George'): [('Janet', 'brother', 'Timothy'), ('Timothy', 'father', 'George')]}]
['brother', 'father']