Did anyone else from the extended Nelson family, besides O, H, D, & R, ever appear on the show? I noticed some other "Nelsons" on the complete imdb cast list.

David & June's son, Daniel, and Rick & Kris' daughter, Tracy, appeared in the 1960's rerun version of the episode "Busy Christmas". Their sister-in-law Barbara Nelson and her two kids, Cathy and Lorie, were in "The Lost Christmas Gift".

Unless I'm mistaken, wasn't Constance (Connie) Harper married to Ozzie's brother, Don, at the time she appeared on the series? She had a recurring role as Miss Edwards at the law office.