Last night, [Nancy] went out with her sister [Amy], accompanied by [Nancy]'s daughter [Heidi].
('Amy', 'Heidi')
Last night, [Nancy] went out with her sister [Amy], accompanied by [Nancy]'s daughter [Heidi].
[{('Amy', 'niece', 'Heidi'): [('Amy', 'sister', 'Nancy'), ('Nancy', 'daughter', 'Heidi')]}]
['sister', 'daughter']