story: [Otto] took his daughter [Rebbeca] to the bookstore, and bought her some books from her favorite author. [Paul] and his brother [Otto] wanted to backpack across Europe together once they graduated college. [Otto] took his son [Dana] for boxing lessons. He felt the boy needed to toughen up.
query: ('Paul', 'Dana')
clean_story: [Paul] and his brother [Otto] wanted to backpack across Europe together once they graduated college. [Otto] took his son [Dana] for boxing lessons. He felt the boy needed to toughen up.
proof_state: [{('Paul', 'nephew', 'Dana'): [('Paul', 'brother', 'Otto'), ('Otto', 'son', 'Dana')]}]