At Christmas 1961, Nelson began dating Sharon Kristin "Kris" Harmon (born June 25, 1945), the daughter of football legend Tom Harmon and actress Elyse Knox (née Elsie Kornbrath) and the older sister of Kelly and Mark Harmon [REF].
In 1980, Nelson met Helen Blair, a part-time model and exotic animal trainer, in Las Vegas [REF].