[Timothy] went fishing with his uncle [Nicholas]. [Timothy] went to the park with his father, [George].
('George', 'Nicholas')
[Timothy] went to the park with his father, [George]. [Timothy] went fishing with his uncle [Nicholas].
[{('George', 'brother', 'Nicholas'): [('George', 'son', 'Timothy'), ('Timothy', 'uncle', 'Nicholas')]}]
['son', 'uncle']