story: [Otto] took his sister [Melissa] to the zoo. [Otto] 'son [Dana] did n't go because he is afraid of animals. [Melissa] gave her brother [Paul] a new sweater for Christmas.
query: ('Melissa', 'Dana')
clean_story: [Otto] took his sister [Melissa] to the zoo. [Otto] 'son [Dana] did n't go because he is afraid of animals.
proof_state: [{('Melissa', 'nephew', 'Dana'): [('Melissa', 'brother', 'Otto'), ('Otto', 'son', 'Dana')]}]