story: [Kerri] is a daughter of [Preston] it seems. [Preston] needed his brother, [Paul], to help with a problem [Paul] went to pick up his son [Robert] from the baseball practice.
query: ('Preston', 'Robert')
clean_story: [Preston] needed his brother, [Paul], to help with a problem [Paul] went to pick up his son [Robert] from the baseball practice.
proof_state: [{('Preston', 'nephew', 'Robert'): [('Preston', 'brother', 'Paul'), ('Paul', 'son', 'Robert')]}]