[Amy] visited her son [Dennis] at college. [Dennis]'s grandfather, [Clarence], took the boy to the store to buy some new shoes.
('Amy', 'Clarence')
[Amy] visited her son [Dennis] at college. [Dennis]'s grandfather, [Clarence], took the boy to the store to buy some new shoes.
[{('Amy', 'father', 'Clarence'): [('Amy', 'son', 'Dennis'), ('Dennis', 'grandfather', 'Clarence')]}]
['son', 'grandfather']