[Natalia] asked her father [Nicholas] to help her with her taxes. [Nicholas] did n't know anything about taxes, so his father, [Clarence], helped her instead.
('Natalia', 'Clarence')
[Natalia] asked her father [Nicholas] to help her with her taxes. [Nicholas] did n't know anything about taxes, so his father, [Clarence], helped her instead.
[{('Natalia', 'grandfather', 'Clarence'): [('Natalia', 'father', 'Nicholas'), ('Nicholas', 'father', 'Clarence')]}]
['father', 'father']