[Theresa] bought some shoes for her father [Clarence]. [Nicolas] wanted to buy his mother, [Theresa], a birthday present. But he did n't know what to get her.
('Nicolas', 'Clarence')
[Nicolas] wanted to buy his mother, [Theresa], a birthday present. But he did n't know what to get her. [Theresa] bought some shoes for her father [Clarence].
[{('Nicolas', 'grandfather', 'Clarence'): [('Nicolas', 'mother', 'Theresa'), ('Theresa', 'father', 'Clarence')]}]
['mother', 'father']