story: [Marian] and [Elliott] took their son [Mark] to the park. [Mark] was very excited, because he knew his grandfather, [Stanley], would be meeting them there.
query: ('Elliott', 'Stanley')
clean_story: [Marian] and [Elliott] took their son [Mark] to the park. [Mark] was very excited, because he knew his grandfather, [Stanley], would be meeting them there.
proof_state: [{('Elliott', 'father-in-law', 'Stanley'): [('Elliott', 'wife', 'Marian'), ('Marian', 'father', 'Stanley')]}, {('Marian', 'father', 'Stanley'): [('Marian', 'son', 'Mark'), ('Mark', 'grandfather', 'Stanley')]}]