[Nicholas] and his sister [Nancy] are decorating for a party. [Nancy]'s daughter [Heidi] thinks the party will be fun.
('Nicholas', 'Heidi')
[Nicholas] and his sister [Nancy] are decorating for a party. [Nancy]'s daughter [Heidi] thinks the party will be fun.
[{('Nicholas', 'niece', 'Heidi'): [('Nicholas', 'sister', 'Nancy'), ('Nancy', 'daughter', 'Heidi')]}]
['sister', 'daughter']