Did the partrage family really play their own instruments?

Well, honey, let me tell you - the Partridge Family may have been jamming on screen, but those instruments were mostly for show. David Cassidy and Shirley Jones did some singing, but the music was mostly played by a group of studio musicians known as The Wrecking Crew. So, technically, no, they didn't really play their own instruments. But hey, they sure looked good doing it!