[Tony] asked his father [Dale] if he could have a video game and he said okay. [Clarence] is [Tony]'s grandfather. [Tony] likes to go fishing with his grandfather.
('Dale', 'Clarence')
[Tony] asked his father [Dale] if he could have a video game and he said okay. [Clarence] is [Tony]'s grandfather. [Tony] likes to go fishing with his grandfather.
[{('Dale', 'father', 'Clarence'): [('Dale', 'son', 'Tony'), ('Tony', 'grandfather', 'Clarence')]}]
['son', 'grandfather']