[Jerry] and his brother, [Timothy], went to visit [Jerry]'s grandfather, [Clarence].
('Timothy', 'Clarence')
[Jerry] and his brother, [Timothy], went to visit [Jerry]'s grandfather, [Clarence].
[{('Timothy', 'grandfather', 'Clarence'): [('Timothy', 'brother', 'Jerry'), ('Jerry', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']