[Nancy] took her daughter [Heidi] to school, then she went shopping with her brother [George].
('George', 'Heidi')
[Nancy] took her daughter [Heidi] to school, then she went shopping with her brother [George].
[{('George', 'niece', 'Heidi'): [('George', 'sister', 'Nancy'), ('Nancy', 'daughter', 'Heidi')]}]
['sister', 'daughter']