[Nancy]'s sister, [Theresa], needed help fixing her car. [Theresa]'s father, [Clarence], offered to do it for her.
('Nancy', 'Clarence')
[Nancy]'s sister, [Theresa], needed help fixing her car. [Theresa]'s father, [Clarence], offered to do it for her.
[{('Nancy', 'father', 'Clarence'): [('Nancy', 'sister', 'Theresa'), ('Theresa', 'father', 'Clarence')]}]
['sister', 'father']