[George] went to the movies with his father [Clarence] and his son [Jerry].
('Clarence', 'Jerry')
[George] went to the movies with his father [Clarence] and his son [Jerry].
[{('Clarence', 'grandson', 'Jerry'): [('Clarence', 'son', 'George'), ('George', 'son', 'Jerry')]}]
['son', 'son']