[Rosetta] went to visit her grandfather [Clarence] for his birthday. Her sister [June] could n't come as she was busy.
('June', 'Clarence')
[Rosetta] went to visit her grandfather [Clarence] for his birthday. Her sister [June] could n't come as she was busy.
[{('June', 'grandfather', 'Clarence'): [('June', 'sister', 'Rosetta'), ('Rosetta', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']