[Nicholas] and his son, [Glen], helped his father [Clarence] with house chores.
('Clarence', 'Glen')
[Nicholas] and his son, [Glen], helped his father [Clarence] with house chores.
[{('Clarence', 'grandson', 'Glen'): [('Clarence', 'son', 'Nicholas'), ('Nicholas', 'son', 'Glen')]}]
['son', 'son']