story: [Christopher] cares about his son, [William]. [Anna] loves her father, [Christopher].
query: ('William', 'Anna')
clean_story: [Christopher] cares about his son, [William]. [Anna] loves her father, [Christopher].
proof_state: [{('William', 'sister', 'Anna'): [('William', 'father', 'Christopher'), ('Christopher', 'daughter', 'Anna')]}]