[Jerry]'s grandfather, [Clarence], took the boy to the store to buy some new shoes. [Lillian] took her son [Jerry] to the park for the afternoon.
('Lillian', 'Clarence')
[Lillian] took her son [Jerry] to the park for the afternoon. [Jerry]'s grandfather, [Clarence], took the boy to the store to buy some new shoes.
[{('Lillian', 'father', 'Clarence'): [('Lillian', 'son', 'Jerry'), ('Jerry', 'grandfather', 'Clarence')]}]
['son', 'grandfather']