[Amy] loves playing checkers with her sister's son. His name is [Douglas]. [Douglas] asked his father, [George] to help him build a birdhouse.
('George', 'Amy')
[Douglas] asked his father, [George] to help him build a birdhouse. [Amy] loves playing checkers with her sister's son. His name is [Douglas].
[{('George', 'sister', 'Amy'): [('George', 'son', 'Douglas'), ('Douglas', 'aunt', 'Amy')]}]
['son', 'aunt']