[George] likes to go fishing with his sister. Her name is [Amy]. [Amy] loves to make cookies for her son. His name is [Milton].
('George', 'Milton')
[George] likes to go fishing with his sister. Her name is [Amy]. [Amy] loves to make cookies for her son. His name is [Milton].
[{('George', 'nephew', 'Milton'): [('George', 'sister', 'Amy'), ('Amy', 'son', 'Milton')]}]
['sister', 'son']