[Kevin] liked playing with his brother [Robert] more than anyone else. This made [Louise] jealous of her brother [Robert].
('Louise', 'Kevin')
[Kevin] liked playing with his brother [Robert] more than anyone else. This made [Louise] jealous of her brother [Robert].
[{('Louise', 'brother', 'Kevin'): [('Louise', 'brother', 'Robert'), ('Robert', 'brother', 'Kevin')]}]
['brother', 'brother']