[Nicholas] is the proud father of the lovely [Dennis] [Nicholas]'s father, [Clarence], bought him some ice cream.
('Dennis', 'Clarence')
[Nicholas] is the proud father of the lovely [Dennis] [Nicholas]'s father, [Clarence], bought him some ice cream.
[{('Dennis', 'grandfather', 'Clarence'): [('Dennis', 'father', 'Nicholas'), ('Nicholas', 'father', 'Clarence')]}]
['father', 'father']