[Michael] loved his mother, [Amy]. [Michael] and his grandfather, [Clarence], went to watch the ball game together.
('Amy', 'Clarence')
[Michael] loved his mother, [Amy]. [Michael] and his grandfather, [Clarence], went to watch the ball game together.
[{('Amy', 'father', 'Clarence'): [('Amy', 'son', 'Michael'), ('Michael', 'grandfather', 'Clarence')]}]
['son', 'grandfather']