[Clarence] asked his daughter [Theresa] for a ride to the Airport. [Theresa] did n't want to go alone so she asked her sister [Nancy] to go with her.
('Nancy', 'Clarence')
[Clarence] asked his daughter [Theresa] for a ride to the Airport. [Theresa] did n't want to go alone so she asked her sister [Nancy] to go with her.
[{('Nancy', 'father', 'Clarence'): [('Nancy', 'sister', 'Theresa'), ('Theresa', 'father', 'Clarence')]}]
['sister', 'father']