Besides June, Kris and Connie Nelson, who remains from the cast and crew of Ozzie and Harriet?

Is writer Don Nelson still living?

Kent McCord is still around.

Unless he has died since David died, then Ozzie's brother Don is still living. (He was much younger than Ozzie; Don was born in 1927.)

And of course, the young boys who made up the Tigers are probably still around--Barry Livingston (who is better known as Ernie on My Three Sons) still is.

Likely many supporting cast members are still around, like the brothers in the fraternity. I know James Stacy, Bruce Belland and Charlie Britt are still alive - all in their 70s now.