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