[Heidi] went to the store with her mother, [Nancy]. While they were in the fruit aisle, they ran into [Nancy]'s brother, [Nicholas].
('Nicholas', 'Heidi')
[Heidi] went to the store with her mother, [Nancy]. While they were in the fruit aisle, they ran into [Nancy]'s brother, [Nicholas].
[{('Nicholas', 'niece', 'Heidi'): [('Nicholas', 'sister', 'Nancy'), ('Nancy', 'daughter', 'Heidi')]}]
['sister', 'daughter']