[Clarence] is an engineer who loves to take his son [Wayne] to the science museum to help him learn about the world [Kevin] bought a book for his father [Wayne].
('Clarence', 'Kevin')
[Clarence] is an engineer who loves to take his son [Wayne] to the science museum to help him learn about the world [Kevin] bought a book for his father [Wayne].
[{('Clarence', 'grandson', 'Kevin'): [('Clarence', 'son', 'Wayne'), ('Wayne', 'son', 'Kevin')]}]
['son', 'son']