story: [Sabrina] and her sister [Maria] played golf together. [Sabrina] won easily. [Nancy]'s first born, [Robert] grew to hate his sister, [Maria].
query: ('Maria', 'Nancy')
clean_story: [Nancy]'s first born, [Robert] grew to hate his sister, [Maria].
proof_state: [{('Maria', 'mother', 'Nancy'): [('Maria', 'brother', 'Robert'), ('Robert', 'mother', 'Nancy')]}]