story: [Errol] loved his mother, [Rose], very much. [Sandra]'s first born, [Mark] grew to hate his sister, [Rose]. [Rose] and her son [Casey] went to the zoo and then out to dinner yesterday.
query: ('Errol', 'Sandra')
clean_story: [Errol] loved his mother, [Rose], very much. [Sandra]'s first born, [Mark] grew to hate his sister, [Rose].
proof_state: [{('Errol', 'grandmother', 'Sandra'): [('Errol', 'mother', 'Rose'), ('Rose', 'mother', 'Sandra')]}, {('Rose', 'mother', 'Sandra'): [('Rose', 'brother', 'Mark'), ('Mark', 'mother', 'Sandra')]}]