story: [Louise] was playing in the sandbox with her brother [Kenneth]. [Alfred] and his brother [Mark] watch [Alfred]'s daughter [Louise] in her school play. [Francisco] is one of [Louise]'s brothers. They have lots of fun together.
query: ('Mark', 'Kenneth')
clean_story: [Alfred] and his brother [Mark] watch [Alfred]'s daughter [Louise] in her school play. [Louise] was playing in the sandbox with her brother [Kenneth].
proof_state: [{('Mark', 'nephew', 'Kenneth'): [('Mark', 'brother', 'Alfred'), ('Alfred', 'son', 'Kenneth')]}, {('Alfred', 'son', 'Kenneth'): [('Alfred', 'daughter', 'Louise'), ('Louise', 'brother', 'Kenneth')]}]