story: [Nancy]'s brother [James] is taking his son [David] to the amusement park. [David] took his brother [Bernard] to Las Vegas to go gambling.
query: ('David', 'Nancy')
clean_story: [Nancy]'s brother [James] is taking his son [David] to the amusement park.
proof_state: [{('David', 'aunt', 'Nancy'): [('David', 'father', 'James'), ('James', 'sister', 'Nancy')]}]