story: [Paul] and his son [Fletcher] went to the skating rink. [Sabrina] asked her brother, [Fletcher], what he was doing this weekend. [Fletcher] told her he was spending it with his brother [Robert].
query: ('Sabrina', 'Robert')
clean_story: [Sabrina] asked her brother, [Fletcher], what he was doing this weekend. [Fletcher] told her he was spending it with his brother [Robert].
proof_state: [{('Sabrina', 'brother', 'Robert'): [('Sabrina', 'brother', 'Fletcher'), ('Fletcher', 'brother', 'Robert')]}]