story: [William] borrowed some money from his sister [Anna]. [William] went to the park with his father, [Christopher].
query: ('Christopher', 'Anna')
clean_story: [William] went to the park with his father, [Christopher]. [William] borrowed some money from his sister [Anna].
proof_state: [{('Christopher', 'daughter', 'Anna'): [('Christopher', 'son', 'William'), ('William', 'sister', 'Anna')]}]