[Amy] and her sister [Lillian] played golf together. [Amy] won easily. [Amy]'s son, [Glen], was busy with school activities and forgot to meet his sister.
('Lillian', 'Glen')
[Amy] and her sister [Lillian] played golf together. [Amy] won easily. [Amy]'s son, [Glen], was busy with school activities and forgot to meet his sister.
[{('Lillian', 'nephew', 'Glen'): [('Lillian', 'sister', 'Amy'), ('Amy', 'son', 'Glen')]}]
['sister', 'son']