Happy Days was the king of creating spin-offs.
Laverne and Shirley, Mork and Mindy, Joanie Loves Chachi
But Happy Days was more successful than its spin-offs.
The Jeffersons spun off from All in the Family and they had fairly equal success.
Andy Griffith spun off from the Danny Thomas Show and I’d say was more successful.
We find out Opie’s mom died when he was a baby in the pilot in the Danny Thomas Show, but his mother is never mentioned in the Andy Griffith Show.
The best spin-off ever is the Simpsons which started as part of the Tracey Ullman Show and is still going 34 years later.
What other spin-offs achieved more than the show they spun from?