More fun and craziness is coming in the Big Bang Theory season 10 as Penny’s mother and brother are coming to town to bring chaos to the already hilarious TV show.

Showrunner Steven Molaro revealed during the San Diego Comic Con 2016 on who will play Penny’s (Kaley Cuoco) mother and brother.

“We’re super excited that Kate Sagal will be playing Penny’s mom,” Entertainment Weekly quoted Molaro saying.

Penny’s family will be introduced in the first episode of season 10. It can be recalled that Penny and Leonard (Johnny Galecki) are going to renew their vows.  The couple eloped at season 8 finale and got married in Las Vegas in the premiere of season 9. However, their family and friends were not present at the ceremony. This time around, everyone is coming to witness their wedding.

This is not the first time Cuoco and Sagal play mother-daughter tandem. Both actresses worked together on 8 Simple Rules on ABC from 2002 to 2005. In the Big Bang Theory season 10, the Sons of Anarchy actress will portray Susan. Penny’s mom has been described as a stressed out mother with a troubled son.

Cuoco also shared her excitement of having Sagal in the show.

Yes yes yes yes !!! Once my tv mom, always my tv mom 😍 love you @kateylous !!!!! #fullcircle @thebigbangtheory__

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Penny’s brother, Randall, will be played by 30 Rock star Jack McBrayer. Randall has been described as a cheerful ex-drug dealer and ex-con.

Molaro earlier teased that more family members will be introduced in the upcoming season.  Sheldon’s mother, Mary Cooper (Laurie Metcalf), and Leonard’s dad, Alfred Hofstadter (Judd Hirsch) are already in season nine. Viewers have met Penny’s father, Wyatt (Keith Carradine), in the previous seasons. He was first introduced in season four.

Meanwhile, another wedding might happen in the CBS hit show this season.

Sheldon (Jim Parsons) and Amy (Mayim Blahnik) are considering taking their relationship to the next level. It can be recalled that the couple has slept together. It was revealed that they will attend a real-life flag convention this season and probably will tie the knot too.

The Big Bang Theory season 10 will premiere on Sept. 19 on CBS.