[Nicholas] went to pick up his daughter [Mary] from school on the last day before summer vacation. [Mary]'s grandfather [Clarence] was n't feeling well after eating at the restaurant.
('Nicholas', 'Clarence')
[Nicholas] went to pick up his daughter [Mary] from school on the last day before summer vacation. [Mary]'s grandfather [Clarence] was n't feeling well after eating at the restaurant.
[{('Nicholas', 'father', 'Clarence'): [('Nicholas', 'daughter', 'Mary'), ('Mary', 'grandfather', 'Clarence')]}]
['daughter', 'grandfather']