[Clarence] took his granddaughter, [April], to see a movie. [April]'s sister [Janet] cried because she could not go.
('Janet', 'Clarence')
[Clarence] took his granddaughter, [April], to see a movie. [April]'s sister [Janet] cried because she could not go.
[{('Janet', 'grandfather', 'Clarence'): [('Janet', 'sister', 'April'), ('April', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']