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