story: [Preston] is the great brother of [Otto]. [Otto] took his son [Dana] for boxing lessons. He felt the boy needed to toughen up. [Preston]'s son [Brian] entered rehab for the ninth time at the age of thirty.
query: ('Otto', 'Brian')
clean_story: [Preston] is the great brother of [Otto]. [Preston]'s son [Brian] entered rehab for the ninth time at the age of thirty.
proof_state: [{('Otto', 'nephew', 'Brian'): [('Otto', 'brother', 'Preston'), ('Preston', 'son', 'Brian')]}]