[Ann] asked her sister [Janet] if she could come over. [Janet]'s grandfather, [Clarence], was there, and he wanted to give her something.
('Ann', 'Clarence')
[Ann] asked her sister [Janet] if she could come over. [Janet]'s grandfather, [Clarence], was there, and he wanted to give her something.
[{('Ann', 'grandfather', 'Clarence'): [('Ann', 'sister', 'Janet'), ('Janet', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']