[Theresa]'s sister, [Nancy], recently started acting. [Nancy] was sewing a sweater for her sister [Amy].
('Amy', 'Theresa')
[Nancy] was sewing a sweater for her sister [Amy]. [Theresa]'s sister, [Nancy], recently started acting.
[{('Amy', 'sister', 'Theresa'): [('Amy', 'sister', 'Nancy'), ('Nancy', 'sister', 'Theresa')]}]
['sister', 'sister']