[Nancy] and her daughter [Heidi] went out to dinner. [Dale] wanted to get a good gift for his sister, [Nancy]
('Dale', 'Heidi')
[Dale] wanted to get a good gift for his sister, [Nancy] [Nancy] and her daughter [Heidi] went out to dinner.
[{('Dale', 'niece', 'Heidi'): [('Dale', 'sister', 'Nancy'), ('Nancy', 'daughter', 'Heidi')]}]
['sister', 'daughter']