Title: Young Sheldon
Content:  In early March 2017, Iain Armitage was cast as the younger Sheldon, as well as Zoe Perry as his mother, Mary Cooper. Perry is the real-life daughter of Laurie Metcalf, who portrays Mary Cooper on The Big Bang Theory. Lance Barber stars as George Cooper Sr., Sheldon's father; he had previously appeared in one episode of The Big Bang Theory. Raegan Revord stars as Missy Cooper, Sheldon's twin sister; Revord getting the part only after repeatedly asking her mother to be allowed to read for the role. Also starring Montana Jordan as George Cooper Jr., Sheldon's older brother. Jim Parsons reprises his role as adult Sheldon Cooper, as narrator for the series. In July 2017, Annie Potts was cast as Meemaw, Sheldon's grandmother.
Title: The Big Bang Theory
Content:  Cooper. Perry is the real-life daughter of Laurie Metcalf, who portrays Mary Cooper on The Big Bang Theory. On March 13, 2017, CBS ordered the spin-off Young Sheldon series. Jon Favreau directed and executive produced the pilot. Created by Lorre and Molaro, the series follows 9-year-old Sheldon Cooper as he attends high school in East Texas. Alongside Armitage as 9-year-old Sheldon Cooper and Perry as Mary Cooper, Lance Barber stars as George Cooper, Sheldon's father; Raegan Revord stars as Missy Cooper, Sheldon's twin sister; and Montana Jordan as George Cooper Jr., Sheldon's older brother. Jim Parsons reprises his role as adult Sheldon Cooper, as narrator for the series. 
Title: List of The Big Bang Theory and Young Sheldon characters
Content:  Mary Cooper (née Tucker) (Laurie Metcalf in The Big Bang Theory, Zoe Perry in Young Sheldon) is Sheldon's loving, overbearing and deeply religious mother from Texas. A devout Southern Baptist, she also has two other children — Sheldon's twin sister Missy and brother Georgie, who is about three or four years older than the twins. Her husband, a rambunctious alcoholic, was also named George but he later died in Sheldon's childhood. To Mary's relief, her other children do not share Sheldon's hyperintelligence, even once commenting to Leonard, "I thank the good Lord my other kids are as dumb as soup". Mary herself 
Title: List of The Big Bang Theory and Young Sheldon characters
Content:  George Cooper Sr. is the father of Georgie, Sheldon, and Missy and the husband of Mary Tucker-Cooper. In The Big Bang Theory, it is established that he died when Sheldon and Missy were fourteen years old. He is portrayed by Lance Barber, who previously portrayed Jimmy Speckerman in one episode of The Big Bang Theory.
Title: Courtney Henggeler
Content:  Henggeler started off her acting career with a main role in the horror B-movie The Bog Creatures in 2003. Two years later, she made a guest appearance in the medical drama House. In 2008, and again in 2018, Henggeler took on the guest role of Missy Cooper, the twin sister of the show's main character, Sheldon Cooper, in the popular sitcom The Big Bang Theory. After other guest roles in various movies and TV shows over the years and a recurring role on the CBS sitcom Mom, Henggeler finally made her breakthrough in 2018 when she landed a starring role on Cobra Kai as Amanda LaRusso, the wife of the original Karate Kid Daniel LaRusso. In 2019 she was featured in Hulu's Episodic Holiday Horror series "In the Dark" playing an overprivileged mother who invites Thanksgiving reenactors into her home to remind her family of the reasons to be thankful (and to show off to their neighbors).
Title: Sheldon Cooper
Content:  Sheldon contrasts strongly with his family, who are neither scientists nor intellectuals. His father George died before the start of The Big Bang Theory, when Sheldon was 14, while his mother Mary is a devout, naive, born-again Christian and loving parent. Sheldon has two siblings: a twin sister, Missy, who is a tall, attractive brunette as an adult; and an older brother, George Jr., who owns a tire store chain headquartered in Dallas called Dr. Tire. The adult Sheldon has stated that both Missy and George Jr. beat up Sheldon during their childhoods, and their mother describes them to be "dumb as soup". In the pilot episode of The Big Bang Theory, 
Title: The Big Bang Theory
Content:  show was picked up for three more seasons. In March 2014, the show was renewed again for three more years through the 2016–17 season. This marked the second time the series gained a three-year renewal. In March 2017, the series was renewed for two additional seasons, bringing its total to 12, and running through the 2018–19 television season. Several of the actors in The Big Bang Theory previously worked together on the sitcom Roseanne, including Johnny Galecki, Sara Gilbert, Laurie Metcalf (who plays Sheldon's mother, Mary Cooper), and Meagen Fay (who plays Bernadette's mother). Additionally, Lorre was a writer on the series for several seasons.
Title: Sheldon Cooper
Content:  Sheldon Lee Cooper, Ph.D., Sc.D., is a fictional character in the CBS television series The Big Bang Theory and its spinoff series Young Sheldon, portrayed by actors Jim Parsons and Iain Armitage respectively (with Parsons as the latter series' narrator). For his portrayal, Parsons has won four Primetime Emmy Awards, a Golden Globe Award, a TCA Award, and two Critics' Choice Television Awards. The character's childhood is the focus of Young Sheldon: the series' first season is set in 1989 when nine-year-old prodigy Sheldon has skipped ahead five grades, to start high school alongside his older brother. The adult Sheldon is a senior theoretical physicist at The California Institute of Technology (Caltech), 
Title: Laurie Metcalf
Content:  Perry. Her work on the Tony Shalhoub-led Monk and the ABC ensemble comedy-drama Desperate Housewives earned her a further two Primetime Emmy Award nominations for Outstanding Guest Actress in a Comedy Series. In 2007, Metcalf made her first appearance as Mary Cooper, the mother of Jim Parsons's character on the top-rated CBS sitcom The Big Bang Theory. She would reprise the role repeatedly over its twelve-season run, and in 2016, her performance earned Metcalf her fourth nomination for the Primetime Emmy Award for Outstanding Guest Actress in a Comedy Series. Her daughter Zoe Perry portrays a younger version of Mary in the spinoff prequel series Young Sheldon.
Title: Zoe Perry
Content:  Zoe Perry (born September 26, 1983) is an American actress. She has appeared as the young Mary Cooper in the CBS sitcom Young Sheldon, a role originated by her mother Laurie Metcalf in the show's predecessor The Big Bang Theory, and in recurring roles on The Family and Scandal.

Question: who plays sheldon cooper mother on the big bang theory?
Answer: Jim Parsons.