[Clarence] wants to take his son [Nicholas] shopping. [Dennis] is looking forward to his special dinner with his dad [Nicholas].
('Dennis', 'Clarence')
[Clarence] wants to take his son [Nicholas] shopping. [Dennis] is looking forward to his special dinner with his dad [Nicholas].
[{('Dennis', 'grandfather', 'Clarence'): [('Dennis', 'father', 'Nicholas'), ('Nicholas', 'father', 'Clarence')]}]
['father', 'father']