story: [Nancy] took her son [Robert] to school this morning because he missed the bus. [Nancy] took her brother [James] and her daughter [Claire] to the exhibition
query: ('James', 'Claire')
clean_story: [Nancy] took her brother [James] and her daughter [Claire] to the exhibition
proof_state: [{('James', 'niece', 'Claire'): [('James', 'sister', 'Nancy'), ('Nancy', 'daughter', 'Claire')]}]