[Heidi] was playing hide-and-seek with her sister [Louise]. [Kevin]'s sister [Louise] asked him for some help planting her garden.
('Heidi', 'Kevin')
[Heidi] was playing hide-and-seek with her sister [Louise]. [Kevin]'s sister [Louise] asked him for some help planting her garden.
[{('Heidi', 'brother', 'Kevin'): [('Heidi', 'sister', 'Louise'), ('Louise', 'brother', 'Kevin')]}]
['sister', 'brother']