story: [Stacy]'s sister [Eustolia] went to sit with his brother [Erik]. [Eustolia] took her father [Peter] out for his birthday. They had a wonderful time. [Stacy] often goes out for lunch with his sister, [Michelle].
query: ('Erik', 'Peter')
clean_story: [Stacy]'s sister [Eustolia] went to sit with his brother [Erik]. [Eustolia] took her father [Peter] out for his birthday. They had a wonderful time.
proof_state: [{('Erik', 'father', 'Peter'): [('Erik', 'sister', 'Eustolia'), ('Eustolia', 'father', 'Peter')]}, {('Erik', 'sister', 'Eustolia'): [('Erik', 'brother', 'Stacy'), ('Stacy', 'sister', 'Eustolia')]}]