story: [Paul]'s son, [Robert], loves trains. [Paul]'s sister, [Crystal], got him a nice model trail set for his birthday. [Paul] and his son [Leo] went to the store to by bread.
query: ('Robert', 'Crystal')
clean_story: [Paul]'s son, [Robert], loves trains. [Paul]'s sister, [Crystal], got him a nice model trail set for his birthday.
proof_state: [{('Robert', 'aunt', 'Crystal'): [('Robert', 'father', 'Paul'), ('Paul', 'sister', 'Crystal')]}]