[Clarence]'s granddaughter [Ann] is coming over to visit him this afternoon. [Douglas] and his sister [Ann] went to the ice skating rink. [Douglas] fell down and [Ann] laughed at him.
('Douglas', 'Clarence')
[Douglas] and his sister [Ann] went to the ice skating rink. [Douglas] fell down and [Ann] laughed at him. [Clarence]'s granddaughter [Ann] is coming over to visit him this afternoon.
[{('Douglas', 'grandfather', 'Clarence'): [('Douglas', 'sister', 'Ann'), ('Ann', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']