[Heidi] does n't like having to babysit her younger brother, [Kevin]. [Heidi] took her younger sister [Louise] to the carnival last weekend.
('Louise', 'Kevin')
[Heidi] took her younger sister [Louise] to the carnival last weekend. [Heidi] does n't like having to babysit her younger brother, [Kevin].
[{('Louise', 'brother', 'Kevin'): [('Louise', 'sister', 'Heidi'), ('Heidi', 'brother', 'Kevin')]}]
['sister', 'brother']