[John] has an aunt named [Theresa]. [George] went to the baseball game with his son [John]
('George', 'Theresa')
[George] went to the baseball game with his son [John] [John] has an aunt named [Theresa].
[{('George', 'sister', 'Theresa'): [('George', 'son', 'John'), ('John', 'aunt', 'Theresa')]}]
['son', 'aunt']