story: [Bernard] always enjoyed playing with his sister, [Mary], when they were growing up. [Bernard] is in the sixth grade. He looks up to his sister [Amanda], who is in the seventh. [Mary] was celebrating her birthday with her mother [Crystal].
query: ('Bernard', 'Crystal')
clean_story: [Bernard] always enjoyed playing with his sister, [Mary], when they were growing up. [Mary] was celebrating her birthday with her mother [Crystal].
proof_state: [{('Bernard', 'mother', 'Crystal'): [('Bernard', 'sister', 'Mary'), ('Mary', 'mother', 'Crystal')]}]