story: [Raymond] played catch with his dad, [Otto] [Melissa] was playing in the sandbox with her brother [Otto]. [William] asked his father, [Otto] to help him build a birdhouse.
query: ('Melissa', 'Raymond')
clean_story: [Melissa] was playing in the sandbox with her brother [Otto]. [Raymond] played catch with his dad, [Otto]
proof_state: [{('Melissa', 'nephew', 'Raymond'): [('Melissa', 'brother', 'Otto'), ('Otto', 'son', 'Raymond')]}]