[Clarence] took his grandson [Timothy] to the concert. [Timothy]'s father [George] showed up later on into the concert.
('George', 'Clarence')
[Clarence] took his grandson [Timothy] to the concert. [Timothy]'s father [George] showed up later on into the concert.
[{('George', 'father', 'Clarence'): [('George', 'son', 'Timothy'), ('Timothy', 'grandfather', 'Clarence')]}]
['son', 'grandfather']