story: [Otto] went to visit his sister [Crystal]. His daughter [Ellen] stayed home with her mother. [Otto] took her daughter [Tammy] for ice cream.
query: ('Crystal', 'Ellen')
clean_story: [Otto] went to visit his sister [Crystal]. His daughter [Ellen] stayed home with her mother.
proof_state: [{('Crystal', 'niece', 'Ellen'): [('Crystal', 'brother', 'Otto'), ('Otto', 'daughter', 'Ellen')]}]