[Amy] went shopping for makeup with her sister [Lillian]. [Amy]'s son [Milton] stayed at home.
('Lillian', 'Milton')
[Amy] went shopping for makeup with her sister [Lillian]. [Amy]'s son [Milton] stayed at home.
[{('Lillian', 'nephew', 'Milton'): [('Lillian', 'sister', 'Amy'), ('Amy', 'son', 'Milton')]}]
['sister', 'son']