[Mary] and her sister [Glen] went to the ice cream shop. [Clarence] enjoys watching movies with his son's daughter. Her name is [Mary].
('Glen', 'Clarence')
[Mary] and her sister [Glen] went to the ice cream shop. [Clarence] enjoys watching movies with his son's daughter. Her name is [Mary].
[{('Glen', 'grandfather', 'Clarence'): [('Glen', 'sister', 'Mary'), ('Mary', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']