The singer's older brother, David, bore a massive resemblance to this future Dallas actor. But the Nelson kid was far younger. Many thought this was Ozzie or even Harriet's brother. There was a scene in the TV movie "Smashup on Interstate 5" -- the film starred Harriet. When Robert Conrad is giving a CHiPs meeting to his subordinate officers a young Jock Ewing indeed appears to be in the class!