What Happened to the Happy Days Cast?

Garry Marshall’s Family Members Appeared On The Show

Garry Marshall loved to have various members of his family show up on Happy Days. Among those who appeared were his mom, two sisters, his son, two daughters, and a couple of nieces. For the record, one of his sisters is Penny Marshall AKA Laverne from Laverne & Shirley. Whenever he could, Marshall would also jump on set to play the drums for various scenes.