[Amy] was talking about food with her sister [Theresa]. [Amy] took her sister [Lillian] out for dinner to celebrate her birthday.
('Lillian', 'Theresa')
[Amy] took her sister [Lillian] out for dinner to celebrate her birthday. [Amy] was talking about food with her sister [Theresa].
[{('Lillian', 'sister', 'Theresa'): [('Lillian', 'sister', 'Amy'), ('Amy', 'sister', 'Theresa')]}]
['sister', 'sister']