story: [Crystal] and her sister [Minnie] had apple pie for dessert. [David], [Crystal]'s son, had cherry pie instead. [Minnie] and her daughter [Tammy] are entering the competition together.
query: ('Minnie', 'David')
clean_story: [Crystal] and her sister [Minnie] had apple pie for dessert. [David], [Crystal]'s son, had cherry pie instead.
proof_state: [{('Minnie', 'nephew', 'David'): [('Minnie', 'sister', 'Crystal'), ('Crystal', 'son', 'David')]}]