story: [Alma] had lunch with her brother [Christopher]. She told him about her son [Robert] getting a scholarship.
query: ('Christopher', 'Robert')
clean_story: [Alma] had lunch with her brother [Christopher]. She told him about her son [Robert] getting a scholarship.
proof_state: [{('Christopher', 'nephew', 'Robert'): [('Christopher', 'sister', 'Alma'), ('Alma', 'son', 'Robert')]}]