[Andrea] needed to go to the store. [Andrea] asked her sister [Ann] for a ride. [Andrea] went to the park to feed birds with her grandfather [Clarence].
('Ann', 'Clarence')
[Andrea] needed to go to the store. [Andrea] asked her sister [Ann] for a ride. [Andrea] went to the park to feed birds with her grandfather [Clarence].
[{('Ann', 'grandfather', 'Clarence'): [('Ann', 'sister', 'Andrea'), ('Andrea', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']