[Amy] was sewing a sweater for her sister [Theresa]. [George] and his sister [Theresa] went to the movies to watch the newest superhero flick.
('George', 'Amy')
[George] and his sister [Theresa] went to the movies to watch the newest superhero flick. [Amy] was sewing a sweater for her sister [Theresa].
[{('George', 'sister', 'Amy'): [('George', 'sister', 'Theresa'), ('Theresa', 'sister', 'Amy')]}]
['sister', 'sister']