Otto Ratburn

Otto Ratburn is the father of Arthur's third grade teacher Mr. Ratburn and substitute teacher Miss Ratburn and husband of Lisa Ratburn. He was only shown during a flashback in "1001 Dads".

Physical appearance
When Otto was younger, as seen in a flashback, he looked much like his son, but with longer brown hair. He was wearing half-glasses, a white shirt, khakis with suspenders, and dark gray loafers.