story: [Peter] took his sister [Lisbeth] to the movies with him to see the new Star Wars film. [Carol] is a sister of [James]. [James] bought his brother [Peter] a present. It was to congratulate him on becoming a father to his new son, [Eustolia].
query: ('Eustolia', 'Carol')
clean_story: [James] bought his brother [Peter] a present. It was to congratulate him on becoming a father to his new son, [Eustolia]. [Carol] is a sister of [James].
proof_state: [{('Eustolia', 'aunt', 'Carol'): [('Eustolia', 'father', 'Peter'), ('Peter', 'sister', 'Carol')]}, {('Peter', 'sister', 'Carol'): [('Peter', 'brother', 'James'), ('James', 'sister', 'Carol')]}]