[Anna] and her two sisters, [Natasha] and [Wilhelmina], took a cake to [Cindy], [Anna]'s mother.
('Natasha', 'Cindy')
[Anna] and her two sisters, [Natasha] and [Wilhelmina], took a cake to [Cindy], [Anna]'s mother.
[{('Natasha', 'mother', 'Cindy'): [('Natasha', 'sister', 'Anna'), ('Anna', 'mother', 'Cindy')]}, {('Natasha', 'sister', 'Anna'): [('Natasha', 'sister', 'Wilhelmina'), ('Wilhelmina', 'sister', 'Anna')]}]
['sister', 'sister', 'mother']