[Lillian] went out to dinner with her sister [Theresa], and [Theresa]'s daughter [Belva].
('Lillian', 'Belva')
[Lillian] went out to dinner with her sister [Theresa], and [Theresa]'s daughter [Belva].
[{('Lillian', 'niece', 'Belva'): [('Lillian', 'sister', 'Theresa'), ('Theresa', 'daughter', 'Belva')]}]
['sister', 'daughter']