[Lillian] showed pictures of her son [Jerry] to her sister [Nancy]
('Nancy', 'Jerry')
[Lillian] showed pictures of her son [Jerry] to her sister [Nancy]
[{('Nancy', 'nephew', 'Jerry'): [('Nancy', 'sister', 'Lillian'), ('Lillian', 'son', 'Jerry')]}]
['sister', 'son']