story: [Christopher] and his son, [William], went to visit [Jason]. [William] is always so happy to go see his grandfather.
query: ('Christopher', 'Jason')
clean_story: [Christopher] and his son, [William], went to visit [Jason]. [William] is always so happy to go see his grandfather.
proof_state: [{('Christopher', 'father', 'Jason'): [('Christopher', 'son', 'William'), ('William', 'grandfather', 'Jason')]}]