Franklin DeWitt is married Mrs. Barrett in Super Special #12 Here Come the Bridesmaids!. He has four children: Lindsey, Taylor, Madeleine, and Ryan from his first marriage to an unknown woman. The BSC sends two baby-sitters to the DeWitt/Barrett house because there are more than four children at a time (the same rule applies at the Pike house).

Mr. DeWitt is a prompt and organized person.

After Franklin and Mrs. Barrett get married, her three children Buddy Barrett, Suzi Barrett, and Marnie Barrett move in with Franklin and his four children.

He has no relation to the in Palo City, California.