[Douglas] went to see his grandfather [Clarence] one day and his sister [Andrea] decided to go with him.
('Clarence', 'Andrea')
[Douglas] went to see his grandfather [Clarence] one day and his sister [Andrea] decided to go with him.
[{('Clarence', 'granddaughter', 'Andrea'): [('Clarence', 'grandson', 'Douglas'), ('Douglas', 'sister', 'Andrea')]}]
['grandson', 'sister']