[Clarence] took his son [Wayne] out to dinner to celebrate his promotion. [Wayne] brought his son, [Jacob], along to celebrate.
('Clarence', 'Jacob')
[Clarence] took his son [Wayne] out to dinner to celebrate his promotion. [Wayne] brought his son, [Jacob], along to celebrate.
[{('Clarence', 'grandson', 'Jacob'): [('Clarence', 'son', 'Wayne'), ('Wayne', 'son', 'Jacob')]}]
['son', 'son']