story: [Peter] does not know he has a son named [Stacy]. [Peter]'s wife, [Lisa], was excited to plan a surprise party for him. [Rose] invited her nephew, [Stacy], over for dinner. [Rose] was playing in the sandbox with her brother [Alfred].
query: ('Peter', 'Alfred')
clean_story: [Peter] does not know he has a son named [Stacy]. [Rose] invited her nephew, [Stacy], over for dinner. [Rose] was playing in the sandbox with her brother [Alfred].
proof_state: [{('Peter', 'brother', 'Alfred'): [('Peter', 'sister', 'Rose'), ('Rose', 'brother', 'Alfred')]}, {('Peter', 'sister', 'Rose'): [('Peter', 'son', 'Stacy'), ('Stacy', 'aunt', 'Rose')]}]