[Nancy] and her nephew [Douglas] played the piano together. [Lillian] loves to make cookies for her son. His name is [Douglas].
('Lillian', 'Nancy')
[Lillian] loves to make cookies for her son. His name is [Douglas]. [Nancy] and her nephew [Douglas] played the piano together.
[{('Lillian', 'sister', 'Nancy'): [('Lillian', 'son', 'Douglas'), ('Douglas', 'aunt', 'Nancy')]}]
['son', 'aunt']