[Timothy]'s grandpa [Clarence] taught him and his brother [John] how to hunt and fish when they were both still very young.
('John', 'Clarence')
[Timothy]'s grandpa [Clarence] taught him and his brother [John] how to hunt and fish when they were both still very young.
[{('John', 'grandfather', 'Clarence'): [('John', 'brother', 'Timothy'), ('Timothy', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']