[Lizzie] got accepted into her dream college. Her father [Robert] could not be any prouder. [Harold] took his daughter, [Marie], to the Cavaliers game on Saturday. [Tracy] and her sister [Marie] are the only children in their family. [Lizzie] is taking her grandfather [Harold] shopping.
('Robert', 'Tracy')
[Lizzie] got accepted into her dream college. Her father [Robert] could not be any prouder. [Lizzie] is taking her grandfather [Harold] shopping. [Harold] took his daughter, [Marie], to the Cavaliers game on Saturday. [Tracy] and her sister [Marie] are the only children in their family.
[{('Robert', 'sister', 'Tracy'): [('Robert', 'father', 'Harold'), ('Harold', 'daughter', 'Tracy')]}, {('Robert', 'father', 'Harold'): [('Robert', 'daughter', 'Lizzie'), ('Lizzie', 'grandfather', 'Harold')]}, {('Harold', 'daughter', 'Tracy'): [('Harold', 'daughter', 'Marie'), ('Marie', 'sister', 'Tracy')]}]
['daughter', 'grandfather', 'daughter', 'sister']