O.K. Crackerby! (1965)

O.K. Crackerby is a rough-and-tumble man from Oklahoma who is also the richest man in the world. But because he lacks the "social graces," high society rejects him. To improve himself and his children, he hires unemployed Harvard graduate St. John Quincy as a tutor. O.K. and St. John are constantly arguing among themselves but stand together to fight the social prejudices of the "upper class." Slim is O.K.'s friend and St. John has a girlfriend, Susan.