story: [Nancy] and her sister [Minnie] played golf together. [Nancy] won easily. [Preston]'s sister, [Minnie], participated in the dance contest. [Preston] needed his brother, [James], to help with a problem
query: ('Preston', 'Nancy')
clean_story: [Preston]'s sister, [Minnie], participated in the dance contest. [Nancy] and her sister [Minnie] played golf together. [Nancy] won easily.
proof_state: [{('Preston', 'sister', 'Nancy'): [('Preston', 'sister', 'Minnie'), ('Minnie', 'sister', 'Nancy')]}]