[Wayne]'s son [Kevin] is in the hospital. [Kevin]'s brother [Robert] accidentally hit him with a hammer.
('Wayne', 'Robert')
[Wayne]'s son [Kevin] is in the hospital. [Kevin]'s brother [Robert] accidentally hit him with a hammer.
[{('Wayne', 'son', 'Robert'): [('Wayne', 'son', 'Kevin'), ('Kevin', 'brother', 'Robert')]}]
['son', 'brother']