[Amy] called [Nancy], her sister, to see if she wanted to go out to eat. [Amy] and her daughter [Mary] went to church. They were both very religious.
('Nancy', 'Mary')
[Amy] called [Nancy], her sister, to see if she wanted to go out to eat. [Amy] and her daughter [Mary] went to church. They were both very religious.
[{('Nancy', 'niece', 'Mary'): [('Nancy', 'sister', 'Amy'), ('Amy', 'daughter', 'Mary')]}]
['sister', 'daughter']