<Ul> <Li> Iain Armitage as Sheldon Cooper , a 9 - year - old child prodigy with a `` once - in - a-generation mind capable of advanced mathematics and science '' . While well - versed in all types of math and science , he is shown to prefer theoretical physics , stating that he decided to pursue the field around the same time as the show began . While academically gifted , Sheldon lacks a full understanding of social cues and behaviors , in addition to having a sense of superiority over everyone around him due to his intelligence . Sheldon is prone to travel his own path even if he gets into trouble along the way . Nevertheless , Sheldon has proven to love his family and almost always has his heart in the right place . </Li> <Li> Zoe Perry as Mary Cooper , Sheldon 's mother . She is very protective and patient with Sheldon but also struggles to understand him at times . She is a devout Christian and so has friction with Sheldon 's atheism and derision of Christianity . Nevertheless , she deeply loves her son and wants to protect him for as long as she can . </Li> <Li> Lance Barber as George Cooper Sr. , Sheldon 's father and the head football coach at Medford High . While often a voice of reason , George is not the brightest member of the family , leading others , especially Meemaw , to doubt him being Sheldon 's father . While he may struggle with understanding his intellectually gifted son , George is a loving father and has defended Sheldon on multiple occasions , earning Sheldon 's love and appreciation . </Li> <Li> Montana Jordan as George `` Georgie '' Cooper Jr. , Sheldon 's older brother . Georgie openly despises Sheldon and never hesitates to bully him . He is not very intelligent and so is mocked and teased by the rest of the family , particularly Sheldon and Meemaw . While he is outwardly confident in himself , Georgie hides deep insecurities over feeling inferior to his genius brother and thus copes by trying to belittle Sheldon 's intelligence in any way he can . He attends Medford High with Sheldon and plays on the football team . </Li> <Li> Raegan Revord as Missy Cooper , Sheldon 's twin sister . She teases Sheldon along with Georgie but not as much . She does not share Sheldon 's intelligence but is very perceptive . While she does not always get along with Sheldon , she finds in her twin brother a solid confidant and has admitted to not feel as whole without him . </Li> <Li> Jim Parsons as the voice of adult Sheldon Cooper , who narrates the series as the older , present - day version of the character . </Li> <Li> Annie Potts as Constance ' Connie ' Tucker , Sheldon 's maternal grandmother , known to him as `` Meemaw '' . She is very close with Mary and her grandchildren but does not think highly of George and often jokes about him . She is the most patient and understanding of Sheldon 's quirks and advises Mary to trust that Sheldon will find his way . </Li> </Ul>
<Ul> <Li> Iain Armitage as Sheldon Cooper , a 9 - year - old child prodigy with a `` once - in - a-generation mind capable of advanced mathematics and science '' . While well - versed in all types of math and science , he is shown to prefer theoretical physics , stating that he decided to pursue the field around the same time as the show began . While academically gifted , Sheldon lacks a full understanding of social cues and behaviors , in addition to having a sense of superiority over everyone around him due to his intelligence . Sheldon is prone to travel his own path even if he gets into trouble along the way . Nevertheless , Sheldon has proven to love his family and almost always has his heart in the right place . </Li> <Li> Zoe Perry as Mary Cooper , Sheldon 's mother . She is very protective and patient with Sheldon but also struggles to understand him at times . She is a devout Christian and so has friction with Sheldon 's atheism and derision of Christianity . Nevertheless , she deeply loves her son and wants to protect him for as long as she can . </Li> <Li> Lance Barber as George Cooper Sr. , Sheldon 's father and the head football coach at Medford High . While often a voice of reason , George is not the brightest member of the family , leading others , especially Meemaw , to doubt him being Sheldon 's father . While he may struggle with understanding his intellectually gifted son , George is a loving father and has defended Sheldon on multiple occasions , earning Sheldon 's love and appreciation . </Li> <Li> Montana Jordan as George `` Georgie '' Cooper Jr. , Sheldon 's older brother . Georgie openly despises Sheldon and never hesitates to bully him . He is not very intelligent and so is mocked and teased by the rest of the family , particularly Sheldon and Meemaw . While he is outwardly confident in himself , Georgie hides deep insecurities over feeling inferior to his genius brother and thus copes by trying to belittle Sheldon 's intelligence in any way he can . He attends Medford High with Sheldon and plays on the football team . </Li> <Li> Raegan Revord as Missy Cooper , Sheldon 's twin sister . She teases Sheldon along with Georgie but not as much . She does not share Sheldon 's intelligence but is very perceptive . While she does not always get along with Sheldon , she finds in her twin brother a solid confidant and has admitted to not feel as whole without him . </Li> <Li> Jim Parsons as the voice of adult Sheldon Cooper , who narrates the series as the older , present - day version of the character . </Li> <Li> Annie Potts as Constance ' Connie ' Tucker , Sheldon 's maternal grandmother , known to him as `` Meemaw '' . She is very close with Mary and her grandchildren but does not think highly of George and often jokes about him . She is the most patient and understanding of Sheldon 's quirks and advises Mary to trust that Sheldon will find his way . </Li> </Ul>
who plays sheldon 's father on young sheldon
who plays sheldon 's father on young sheldon
Lance Barber
Lance Barber