[Nancy] picked up her daughter [Heidi] from school early. [Heidi] and her sister [Louise] have never been close. Still, they love each other because they are family.
('Louise', 'Nancy')
[Heidi] and her sister [Louise] have never been close. Still, they love each other because they are family. [Nancy] picked up her daughter [Heidi] from school early.
[{('Louise', 'mother', 'Nancy'): [('Louise', 'sister', 'Heidi'), ('Heidi', 'mother', 'Nancy')]}]
['sister', 'mother']