story: [Crystal] took her son [David] to the football game. [David] brought his mother to see her sister [Nancy]. [Crystal] visited her son [Thomas] at college.
query: ('Crystal', 'Nancy')
clean_story: [Crystal] took her son [David] to the football game. [David] brought his mother to see her sister [Nancy].
proof_state: [{('Crystal', 'sister', 'Nancy'): [('Crystal', 'son', 'David'), ('David', 'aunt', 'Nancy')]}]