story: [Lisa] visited her son [Stacy] at college. [Alfred] took his brother [James] out to get drinks after a long work week. [Lisa] and her brother [James] sat down together to clip coupons. [Carol] is a sister of [Alfred].
query: ('Alfred', 'Stacy')
clean_story: [Alfred] took his brother [James] out to get drinks after a long work week. [Lisa] and her brother [James] sat down together to clip coupons. [Lisa] visited her son [Stacy] at college.
proof_state: [{('Alfred', 'nephew', 'Stacy'): [('Alfred', 'sister', 'Lisa'), ('Lisa', 'son', 'Stacy')]}, {('Alfred', 'sister', 'Lisa'): [('Alfred', 'brother', 'James'), ('James', 'sister', 'Lisa')]}]