[Nicholas] enjoys playing tennis with his sister and her son. Her son is named [Douglas]. [Douglas] was so excited to introduce his new girlfriend to his mother, [Lillian].
('Lillian', 'Nicholas')
[Douglas] was so excited to introduce his new girlfriend to his mother, [Lillian]. [Nicholas] enjoys playing tennis with his sister and her son. Her son is named [Douglas].
[{('Lillian', 'brother', 'Nicholas'): [('Lillian', 'son', 'Douglas'), ('Douglas', 'uncle', 'Nicholas')]}]
['son', 'uncle']