I remember Rankin-Bass made cartoons of both the Jackson 5 AND the Osmonds about the same year(1971-72)-a thin story line with always, I think it was,one or two songs per show that were really the first kid's rock videos of their kind- that I am sure, like the old 60's "Beatles" cartoon show, we'll never see again thanks to numerous cross-over rights issues unless on bootlegs or something. The Osmonds were sure big in the 70's -they and the Jacksons were competing family acts(though, not intentionally so). And they sure did do some hard rock-Crazy Horses being the most "metal".
The Donny and Marie Show sort of eclipsed the whole "Osmonds" act after awhile. The funniest coincidence was when they did this Star Wars themed show about Fall/Xmas 1977(The show got all the costumes and droids and such from Lucas) when Star Wars was all the rage and Donny and Marie were Luke Skywalker and Princess Leia respectively and we all thought..."hmmm"...and that was YEARS before we were told that Luke and Leia in THE RETURN OF THE JEDI were in fact, brother and sister!! Or maybe Lucas got the idea from Donny and Marie? LOL.
The best D&M stint was the Pepsi Twist ad with Ozzie Osborne imagining his two kids were in fact "The Osmonds" and Donny and Marie appear-and the look on Ozzie's face. That was actually funny when it first ran.