[Clarence] made a grilled cheese for his son [Wayne]. [Wayne]'s brother [Dale] ate a salad.
('Clarence', 'Dale')
[Clarence] made a grilled cheese for his son [Wayne]. [Wayne]'s brother [Dale] ate a salad.
[{('Clarence', 'son', 'Dale'): [('Clarence', 'son', 'Wayne'), ('Wayne', 'brother', 'Dale')]}]
['son', 'brother']