story: [Mary] was playing in the sandbox with her brother [David]. [Crystal] was so proud of her daughter [Mary] for getting straight A's this semester. [Crystal] went on a vacation with her brother [Preston].
query: ('Mary', 'Preston')
clean_story: [Crystal] was so proud of her daughter [Mary] for getting straight A's this semester. [Crystal] went on a vacation with her brother [Preston].
proof_state: [{('Mary', 'uncle', 'Preston'): [('Mary', 'mother', 'Crystal'), ('Crystal', 'brother', 'Preston')]}]