[Amy] and her sister [Lillian] had apple pie for dessert. [Milton], [Amy]'s son, had cherry pie instead.
('Lillian', 'Milton')
[Amy] and her sister [Lillian] had apple pie for dessert. [Milton], [Amy]'s son, had cherry pie instead.
[{('Lillian', 'nephew', 'Milton'): [('Lillian', 'sister', 'Amy'), ('Amy', 'son', 'Milton')]}]
['sister', 'son']