story: [Nancy] and her brother [James] played ball outside. [Nancy]'s brother [Preston] stayed inside. [Edward]'s father's name is [Preston].
query: ('Preston', 'James')
clean_story: [Nancy] and her brother [James] played ball outside. [Nancy]'s brother [Preston] stayed inside.
proof_state: [{('Preston', 'brother', 'James'): [('Preston', 'sister', 'Nancy'), ('Nancy', 'brother', 'James')]}]