[Jerry]'s father [George] is going to coach the team this year. [Clarence] is [Jerry]'s favorite grandfather.
('George', 'Clarence')
[Jerry]'s father [George] is going to coach the team this year. [Clarence] is [Jerry]'s favorite grandfather.
[{('George', 'father', 'Clarence'): [('George', 'son', 'Jerry'), ('Jerry', 'grandfather', 'Clarence')]}]
['son', 'grandfather']