story: [Michelle] wrote a nice letter to her grandson [Dana]. [Dana] is in the sixth grade. He looks up to his sister [Rebbeca], who is in the seventh. [Michelle] talks to her son [Otto] every day.
query: ('Michelle', 'Rebbeca')
clean_story: [Michelle] wrote a nice letter to her grandson [Dana]. [Dana] is in the sixth grade. He looks up to his sister [Rebbeca], who is in the seventh.
proof_state: [{('Michelle', 'granddaughter', 'Rebbeca'): [('Michelle', 'grandson', 'Dana'), ('Dana', 'sister', 'Rebbeca')]}]