Meet the Kids of “The Big Bang Theory” Cast

In June 2026, Kaley Cuoco announced that she's expecting her second child with fiancé Tom Pelphrey

Several of The Big Bang Theory's nerdy friends ultimately found love and welcomed children — something the cast members have done off-screen, as well.

In the series, Howard and Bernadette welcomed two kids, Halley and Neil, and in real life, both actors — Melissa Rauch and Simon Helberg — have become parents, too. During the final season, audiences learned that Penny and Leonard were expecting a child, and both actors — Kaley Cuoco and Johnny Galecki, respectively — have also become parents.

“I love her so much, I really do,” Cuoco told PEOPLE in January 2024 about her daughter, Matilda. “She is very funny. I think selfishly what I love the most is she finds me hilarious. I think she’s my best audience.”

In June 2026, Cuoco announced that she is expecting her second child with fiancé Tom Pelphrey.

Here's everything to know about the kids of the Big Bang Theory cast members.

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Kaley Cuoco’s daughter and baby on the way

Cuoco shares her daughter, Matilda, with her fiancé, Pelphrey — and has another little girl on the way!

In March 2023, she and her fiancé welcomed their daughter Matilda.

“Introducing, Matilda Carmine Richie Pelphrey, the new light of our lives!” Cuoco wrote on Instagram next to a picture of her daughter. “We are overjoyed and grateful for this little miracle 💓 Thank you to the doctors, nurses, family and friends who have helped us immensely over the last few days. We are blessed beyond belief.”

In June 2026, Cuoco shared a collection of photos showcasing life with her daughter, including playing tennis and dressing up as a superhero.

Days later, the couple announced they were expecting another child. Cuoco broke the news in an Instagram post, sharing a photo of her family surrounding a cake, which has “It’s a…” written in frosting.

“💖completing our little family , what a dream come true ! 💖,” she captioned the image. “This second time around journey has been a little windier in many ways , but wow we are so grateful for this moment!!”

She also revealed that their second child will be another girl. “Little sissy on the way!!!" Cuoco added. "@tommypelphrey girl dad for life.”

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Johnny Galecki’s two children

Just seven months after the finale, Galecki welcomed his first child with then-girlfriend, Alaina Meyer.

His son Avery was born in December 2019. Galecki shared the news with a photo of his newborn on Instagram, writing, “With full and grateful hearts we welcome our beautiful son into this incredible world. Thank you for all of your love and support. ❤️❤️❤️.”

In 2020, Galecki and Meyer split. Four years later, Galecki made two major announcements in his March 2024 Architectural Digest cover story, revealing that he had privately gotten married to Morgan Galecki and they had welcomed a daughter, Oona Evelena.

In October 2025, Galecki gave fans another rare glimpse into his largely private life when he shared images of his family at Disney World on Instagram.

"More unforgettable memories made @waltdisneyworld @disneyparks Such a perfect age for the Shorties. (And by “Shorties,” I mean the Wife and I.)" he captioned the pictures. "Thank you to all who made it so wonderful. And a special thank you to our new, profoundly talented friends.”

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Simon Helberg’s two children

Helberg has been married to French filmmaker Jocelyn Towne since 2007. In May 2012, they welcomed their first child, daughter Adeline, followed by a son, Wilder, in April 2014.

In 2016, Helberg’s character, Howard, also became a dad on the show, and the actor told PEOPLE at the time that being an actual father helped him relate to his character.

“You bring everything you have in your arsenal to every character, so it’s helpful to have experience as a dad,” he said. “I’m sure the writers are gonna make him a pretty clumsy, inept father, which … sometimes it starts that way, so that I can also relate to. There’s a nice learning curve, so hopefully he’ll grow up a bit.”

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Melissa Rauch’s two children

In 2016, Rauch’s character Bernadette became a parent alongside her husband, Howard. Just one year later, the actress became a mom in real life alongside her husband, Winston Rauch.

Rauch announced her pregnancy in a July 2017 essay for Glamour, reflecting on a previous miscarriage. “I know it’s made me grateful for every moment of my current pregnancy and I hope it will make me a better mother in some capacity when I can finally hold the child that has been in my heart in my arms," she wrote.

The actress ultimately welcomed her daughter Sadie in December 2017, followed by her son Brooks in May 2020, who was born during the COVID pandemic.

"His arrival was made possible, in no small part, by the front line heroes — the nurses and doctors who show up each day to make sure that life keeps marching forward, regardless of the circumstances," Rauch wrote on Instagram next to an image of Brooks’ baby cap. "Words can't describe how grateful I am to have this baby boy join our family, but to say that it is a surreal time to be bringing life into the world is an understatement."

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Mayim Bialik’s two sons

In real life, Mayim Bialik is a mom of two. From 2003 to 2013, she was married to Michael Stone, and the couple had two sons: Miles, born in October 2005, and Frederick, born in August 2008.

In June 2021, while hosting an episode of Jeopardy!, she revealed that her son Miles encouraged her to try out for the gig. "As I start my second week of guest-hosting Jeopardy!, I want to thank my 15-year-old, Miles," Bialik said on the show. "He was the one who first suggested I give this a try and I hope I am making him and his little brother, Frederick, proud."

Despite having a PhD herself (just like her character!), Bialik has shared that being a mother can still present its challenges. Sometimes, she lets her kids know that she needs a moment to work through conflicts.

"What I learned to say to them is, I've never been your parent with you at the age you're at with me at the place I'm at in my life until this moment," she recalled on a December 2022 episode of her podcast, Mayim Bialik’s Breakdown. "So, give me a second, because I don't have all the answers."

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