[Dale] and [George], both brothers, like to go to the ball game with [George]'s son, [John].
('John', 'Dale')
[Dale] and [George], both brothers, like to go to the ball game with [George]'s son, [John].
[{('John', 'uncle', 'Dale'): [('John', 'father', 'George'), ('George', 'brother', 'Dale')]}]
['father', 'brother']