Partridge Partridge family predates Norman Lear‘s shows. And mash does as well for all intents and purposes.
Norman Lear was a credited writer on several programs in the 1960’s and also did uncredited work on several other programs in the 1960’s “funnying up” scripts and sometimes fine tuning dialogue and storylines. This is a common practice in Hollywood that continues to this day.
Lear did frequent work for Screen Gems (which made the The Partridge Family) and themes from these shows often showed up in Lear’s later productions and you could argue he was plagiarizing them except for the probability that he was the original writer anyway.