story: [Crystal] and her sister [Minnie] went shopping at the mall. [Crystal]'s daughter [Mary] stayed home to study. [Crystal] took her son [Bernard] to the football game.
query: ('Minnie', 'Mary')
clean_story: [Crystal] and her sister [Minnie] went shopping at the mall. [Crystal]'s daughter [Mary] stayed home to study.
proof_state: [{('Minnie', 'niece', 'Mary'): [('Minnie', 'sister', 'Crystal'), ('Crystal', 'daughter', 'Mary')]}]