Los Angeles: Actress Katey Sagal has been roped in to play Kaley Cuoco's character’s mother in popular sitcom “Big Bang Theory”, while Jack McBrayer will star as her brother. The show's executive producer Steve Molaro shared the news at a panel discussion at San Diego Comic-Con on Friday. The event runs at the San Diego Convention Center until July 24, reports ew.com. “We are finally going to meet more of Penny’s family,” Molaro said. He added: “We’re going to be meeting Penny’s mom and her brother in the first episode back. We’re super excited that Katey Sagal will be playing Penny’s mom.” This isn’t the first time the “Sons of Anarchy” star will be playing Cuoco’s mother on TV. The duo starred together on the ABC comedy “8 Simple Rules” too. During the panel discussion, Molaro said McBrayer’s character will be a “drug dealer and he has just gotten out of prison. We needed to find the right person to get for this. I think we did a pretty good job on the casting. He’s a little scary.” In other news, Molaro revealed that Sheldon (played by Jim Parsons) and Amy (played by Mayim Bialik) will go to a real-life flag convention in season 10.