story: [Lisbeth], [James], and [Peter] all went out for a family gathering at the bar. [James] had to explain why [Diana] could n't go out with [James]'s brother, [Peter]. [Peter] wanted to get a good gift for his sister, [Carol]
query: ('Peter', 'Diana')
clean_story: [Lisbeth], [James], and [Peter] all went out for a family gathering at the bar. [James] had to explain why [Diana] could n't go out with [James]'s brother, [Peter].
proof_state: [{('Peter', 'niece', 'Diana'): [('Peter', 'brother', 'James'), ('James', 'daughter', 'Diana')]}, {('Peter', 'brother', 'James'): [('Peter', 'sister', 'Lisbeth'), ('Lisbeth', 'brother', 'James')]}]