[Nicolas] took his mother, [Theresa], and his sister, [Belva], to the store.
('Belva', 'Theresa')
[Nicolas] took his mother, [Theresa], and his sister, [Belva], to the store.
[{('Belva', 'mother', 'Theresa'): [('Belva', 'brother', 'Nicolas'), ('Nicolas', 'mother', 'Theresa')]}]
['brother', 'mother']