story: [Melissa] took her younger sister [Nancy] to the carnival last weekend. [Crystal] was talking about food with her sister [Nancy]. [Crystal] called her mother [Michelle] to let her know she will be back home soon.
query: ('Crystal', 'Melissa')
clean_story: [Crystal] was talking about food with her sister [Nancy]. [Melissa] took her younger sister [Nancy] to the carnival last weekend.
proof_state: [{('Crystal', 'sister', 'Melissa'): [('Crystal', 'sister', 'Nancy'), ('Nancy', 'sister', 'Melissa')]}]