[Lillian] visited her son [Timothy] at college. [Clarence]'s grandson [Timothy] wants a new sled for Christmas.
('Lillian', 'Clarence')
[Lillian] visited her son [Timothy] at college. [Clarence]'s grandson [Timothy] wants a new sled for Christmas.
[{('Lillian', 'father', 'Clarence'): [('Lillian', 'son', 'Timothy'), ('Timothy', 'grandfather', 'Clarence')]}]
['son', 'grandfather']