[Clarence] is taking his son [Nicholas] out for coffee. [Nicholas] is frustrated teaching his son how to drive. His son is [Dennis].
('Clarence', 'Dennis')
[Clarence] is taking his son [Nicholas] out for coffee. [Nicholas] is frustrated teaching his son how to drive. His son is [Dennis].
[{('Clarence', 'grandson', 'Dennis'): [('Clarence', 'son', 'Nicholas'), ('Nicholas', 'son', 'Dennis')]}]
['son', 'son']