Father and Son Day is the ninth episode of Season 2 of Diff'rent Strokes and the thirty-second episode overall. The episode was written by Joseph Sirota and Elaine Newman and directed by Gerren Keith. It originally aired on November 14, 1979 on NBC.
Willis wants to beat an obnoxious braggart in an upcoming father and son athletic competition at the YMCA. Believing Mr. Drummond may not be able do it, he asks another man to be his "father".