[Linda] and her sister [Robert] went to the ice cream shop. [Linda] was watching TV with her grandfather [Clarence].
('Robert', 'Clarence')
[Linda] and her sister [Robert] went to the ice cream shop. [Linda] was watching TV with her grandfather [Clarence].
[{('Robert', 'grandfather', 'Clarence'): [('Robert', 'sister', 'Linda'), ('Linda', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']