story: [Christopher]'s daughter, [Anna], always preferred her grandfather, [Jason], over everyone else.
query: ('Christopher', 'Jason')
clean_story: [Christopher]'s daughter, [Anna], always preferred her grandfather, [Jason], over everyone else.
proof_state: [{('Christopher', 'father', 'Jason'): [('Christopher', 'daughter', 'Anna'), ('Anna', 'grandfather', 'Jason')]}]