[Nancy] baked a cake for her son [Jeff]. [Jeff] went fishing with his uncle [George].
('Nancy', 'George')
[Nancy] baked a cake for her son [Jeff]. [Jeff] went fishing with his uncle [George].
[{('Nancy', 'brother', 'George'): [('Nancy', 'son', 'Jeff'), ('Jeff', 'uncle', 'George')]}]
['son', 'uncle']