[Linda] was playing in the sandbox with her brother [Jeff]. [Jeff] asked his brother [Robert] to help him fix his car and he said he would after he got off work.
('Linda', 'Robert')
[Linda] was playing in the sandbox with her brother [Jeff]. [Jeff] asked his brother [Robert] to help him fix his car and he said he would after he got off work.
[{('Linda', 'brother', 'Robert'): [('Linda', 'brother', 'Jeff'), ('Jeff', 'brother', 'Robert')]}]
['brother', 'brother']