story: [Carol] baked a cake for her son [Michael]. [Carol] and her brother [Peter] are taking [Carol]'s son [David] to the park. [Lisbeth] went with her nephew [David] to pick out a pet puppy for his birthday.
query: ('Peter', 'Lisbeth')
clean_story: [Carol] and her brother [Peter] are taking [Carol]'s son [David] to the park. [Lisbeth] went with her nephew [David] to pick out a pet puppy for his birthday.
proof_state: [{('Peter', 'sister', 'Lisbeth'): [('Peter', 'sister', 'Carol'), ('Carol', 'sister', 'Lisbeth')]}, {('Carol', 'sister', 'Lisbeth'): [('Carol', 'son', 'David'), ('David', 'aunt', 'Lisbeth')]}]