[Nicholas] took his son [Milton] for boxing lessons. He felt the boy needed to toughen up. [Milton]'s grandfather, [Clarence], was a world war II veteran.
('Nicholas', 'Clarence')
[Nicholas] took his son [Milton] for boxing lessons. He felt the boy needed to toughen up. [Milton]'s grandfather, [Clarence], was a world war II veteran.
[{('Nicholas', 'father', 'Clarence'): [('Nicholas', 'son', 'Milton'), ('Milton', 'grandfather', 'Clarence')]}]
['son', 'grandfather']