Marty Taylor, is Tim's youngest brother by ten years, portrayed by William O'Leary. As their father died when Marty was just one year old, Tim is the closest thing he knows as a father. Marty was often picked on by his older brothers, much as Mark is by Brad and Randy. Thanks to Tim in episode 15 in season seven Tim said that Marty use to wet the bed and doesn't pay attention to his personal life.