The Partridge Family
From the 1970-74 TV show of the same name. This singing TV family was loosely based on real life singing family The Cowsills ("Indian Lake"). Apparently they were also set to star in the series, but the network insisted in Shirley Jones as Mom, so the Cowsills bailed rather than not have their real Mom involved. But later we all got to see Susan Dey naked, so it all works out.
Shirley Partridge (Shirley Jones) was the singing/keyboard-playing Mom, who sang in real life (Oklahoma! ), but she frequently ended up taking a vocal back seat to feather-haired and feather-talented teen heart-throb Keith Partridge (David Cassidy). As a rock star, he was given lead guitar duties. Why Mrs. Partridge never demanded he cut his hair and get a real job, I'll never know.
Laurie Partridge (Susan Dey) frequently faked playing the keyboards and acting. Danny Partridge (Danny Bonaduce) was shown playing bass. Christopher Partridge (Jeremy Gelbwaks 1970-71 / Brian Forster 1971-74) was the little boy Partridge who played drums. Tracy Partridge (Suzanne Crough) was the little girl Partridge who played tambourine. Reuben Kincaid (Dave Madden) was the incompetent, yet creepy manager.
There was also a short lived Saturday morning animated TV show, The Partridge Family, 2200 A.D.