story: [Preston]'s son [Edward] had gone missing one afternoon. [Crystal] helped her brother [Preston] look for him. [Preston]'s wife, [Melissa], went to a gas station to check on the gas prices
query: ('Crystal', 'Edward')
clean_story: [Preston]'s son [Edward] had gone missing one afternoon. [Crystal] helped her brother [Preston] look for him.
proof_state: [{('Crystal', 'nephew', 'Edward'): [('Crystal', 'brother', 'Preston'), ('Preston', 'son', 'Edward')]}]