[Amy]'s daughter, [Mary], just graduated high school. [Theresa] was talking about food with her sister [Amy].
('Theresa', 'Mary')
[Theresa] was talking about food with her sister [Amy]. [Amy]'s daughter, [Mary], just graduated high school.
[{('Theresa', 'niece', 'Mary'): [('Theresa', 'sister', 'Amy'), ('Amy', 'daughter', 'Mary')]}]
['sister', 'daughter']