[Kevin] visited his aunt [Theresa]. [Nancy] takes her son [Kevin] to the park every Saturday.
('Nancy', 'Theresa')
[Nancy] takes her son [Kevin] to the park every Saturday. [Kevin] visited his aunt [Theresa].
[{('Nancy', 'sister', 'Theresa'): [('Nancy', 'son', 'Kevin'), ('Kevin', 'aunt', 'Theresa')]}]
['son', 'aunt']