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How many Happy Days spin-offs are there?

I know there were a few but I don't know the titles of the shows.

Public Comments

1. i know laverne and shirley plus the one with fonzie's little cousin and the little sister of ron howard's character
2. I know that Mork & Mindy, Laverne & Shirley and Joanie Loves Chachi were spin offs, I don't know if there were more or not.
3. Laverne and Shirley Blansky's Beauties Mork and Mindy Joanie Loves Chachi
4. Laverne and Shirley Mork and Mindy Joanie Loves Chachi
5. three laveerne and shirley chaci and joani mork and mindy
6. Laverne and Shirley Jonie and Chachie(spelling?) Mork and Mindy
7. Laverne & Shirley, Blansky's Beauties, Mork and Mindy, Out of the Blue, and Joanie Loves Chachi.
8. Happy days was a spin off of one of the episodes of "Love, American Style" Shows spun off from Happy days: "Laverne & Shirley" "Blansky's Beauties" "Mork & Mindy" "Out of the Blue" "Joanie Loves Chachi" Related shows: "The New Love, American Style "