[Dale] and his son [Nicolas] went to the park to look for different kinds of birds. [Dale] asked his father [Clarence] if he could borrow some money.
('Nicolas', 'Clarence')
[Dale] and his son [Nicolas] went to the park to look for different kinds of birds. [Dale] asked his father [Clarence] if he could borrow some money.
[{('Nicolas', 'grandfather', 'Clarence'): [('Nicolas', 'father', 'Dale'), ('Dale', 'father', 'Clarence')]}]
['father', 'father']