story: [James] took his son [Dan] for boxing lessons. He felt the boy needed to toughen up. [Christopher] tripped his brother [James] in the living room.
query: ('Christopher', 'Dan')
clean_story: [Christopher] tripped his brother [James] in the living room. [James] took his son [Dan] for boxing lessons. He felt the boy needed to toughen up.
proof_state: [{('Christopher', 'nephew', 'Dan'): [('Christopher', 'brother', 'James'), ('James', 'son', 'Dan')]}]