[Louise] does n't like having to babysit her younger brother, [Robert]. [Kevin] and his brother [Robert] are fighting again.
('Louise', 'Kevin')
[Louise] does n't like having to babysit her younger brother, [Robert]. [Kevin] and his brother [Robert] are fighting again.
[{('Louise', 'brother', 'Kevin'): [('Louise', 'brother', 'Robert'), ('Robert', 'brother', 'Kevin')]}]
['brother', 'brother']