story: [Lisa] and her son [Erik] had lunch together at a local Chinese restaurant. [Lisbeth] took her younger sister [Carol] to the carnival last weekend. [Carol] is taking her nephew [Erik] to the park. [Erik] went to the park with his father, [Peter].
query: ('Peter', 'Lisbeth')
clean_story: [Erik] went to the park with his father, [Peter]. [Carol] is taking her nephew [Erik] to the park. [Lisbeth] took her younger sister [Carol] to the carnival last weekend.
proof_state: [{('Peter', 'sister', 'Lisbeth'): [('Peter', 'sister', 'Carol'), ('Carol', 'sister', 'Lisbeth')]}, {('Peter', 'sister', 'Carol'): [('Peter', 'son', 'Erik'), ('Erik', 'aunt', 'Carol')]}]