George Cooper Jr.

George Cooper Jr. is the eldest of George and Mary Cooper, as well as the older brother of Sheldon and Missy Cooper by four or five years (depending on birth month and year). He has been mentioned early in the series before his first appearance in the penultimate episode of Season 11. He was named after his father George Sr., who died before the show started.

Series Overview
His mother calls both him and Missy "dumb as soup" in "The Luminous Fish Effect" (S1E04), though this may be an exaggeration.

Sheldon mentions him in "The Jiminy Conjecture" (S3E02), saying "I grew up with an older brother and a very contentious twin sister."

Sheldon's family pedigree, depicted briefly in "The Cruciferous Vegetable Amplification" (S4E02), shows a brother as well as a twin sister.

Sheldon mentions in "The Fish Guts Displacement" (S6E10), that his brother would sneak into their father's truck and drink his driving whiskey.

In "The Cooper Extraction" (S7E11) Sheldon mentions "my brother's kidney stone", presumably meaning his.

In "The Fortification Implementation" (S8E20), Sheldon tells Amy that his brother and sister built forts in the living room and wouldn't let Sheldon in, which he hated so much.

In "The Maternal Combustion" (S8E23), Sheldon tells Leonard's mother Beverly that his brother and sister are mouth-breathing idiots.

In "The Matrimonial Momentum" (S9E01), Mary Cooper mentions that Sheldon's brother has a girlfriend and that she would not let him give her grandmother's ring (which she gave to Sheldon for Amy) to that whore. When Sheldon asks if Mary Magdalene was a woman of ill repute, Mary tells Sheldon that when his idiot brother redeems mankind, he can date whoever he wants (This suggesting that despite being a loving parent, Mary is on bad terms with George Jr.).

Sheldon briefly talks about his brother while filming his part of Leonard Nimoy's documentary in "The Spock Resonance" (S9E07).

In "The Solder Excursion Diversion" (S9E19), while Sheldon is with Amy at his storage unit, he shows her a golf ball which Sheldon's brother threw at Sheldon's head which left a dent.

In "The Matrimonial Metric" (S11E12), Sheldon mentioned his brother while discussing candidates for the best man for his wedding with Amy.

Georgie made his first appearance in "The Sibling Realignment". He runs a chain of tire stores he founded called "Dr. Tire", which is the most successful chain in the state, and is mad that Sheldon only comes to see him when he wants something. Georgie wants Sheldon to apologize because George had to take care of their emotionally devastated mother and teenage Missy after their father died and Sheldon leaving for college afterwards. To make matters worse, Sheldon's college attendance, and then studying in Germany, cost the family a lot of money and George Jr. had to fund his first tire store from scratch. He also holds some resentment for Sheldon being the child their mother is most proud of, despite Georgie's sacrifices to make his business a success. Georgie also had looked after him much like Leonard does, by apologizing to others when he is rude and driving him everywhere. Sheldon finally gets what happened between them and apologizes. As a result, Georgie attends Sheldon's wedding.

George Jr. appeared again in the season 12 episode "The Tam Turbulence", where he talks to Leonard, Howard and Raj via webcam about Sheldon's childhood friend Tam, whom they are curious about.

His Young Sheldon self appeared through a videotape in "The VCR Illumination".

When Sheldon and Amy won the Nobel Prize in "The Change Constant", he and two of his ex-wives sent Sheldon congratulatory text messages. Sheldon also mentioned him in his Nobel acceptance speech.

Trivia

 * As a teenager, George went to school with his brother in high school.
 * George and Sheldon don't get along, and the pilot of Young Sheldon explains that it's because George is tired of always being compared to his brother.
 * After his father died, he started to go by George rather than Georgie.
 * George appeared at Sheldon and Amy's Wedding on season 11 finale.
 * He has been shown to have a liking towards the show "Who's The Boss?", and also one of the shows main cast members, Tony Danza.
 * He was born out of wedlock.
 * When Sheldon won the Nobel Prize in the last two episodes, George Jr. sent him a congratulations text along with the rest of their family and two of his ex-wives.
 * He and Leonard Hofstadter became friends and swap stories putting up with Sheldon.
 * George is also similar to Leonard. They have both put up with Sheldon for quite long, both their mothers are more proud of Sheldon than they are of them and they each have one brother and one sister.
 * George owns a chain of tire stores and he is wealthy, a.k.a. he is a self-made rich guy.
 * Mary had George Jr when she was 24 years old.

Family

 * Father: George Cooper Sr.
 * Mother: Mary Cooper
 * Brother: Sheldon Cooper
 * Sister: Missy Cooper
 * Grandfather: Pop-Pop
 * Grandmother: Meemaw
 * Uncle: Carl
 * Uncle: Edward
 * Uncle: Unnamed uncle who gave children gifts like Santa and was not arrested in Oklahoma for his actions.
 * Uncle: Uncle Roger
 * Aunt: Aunt Ruth
 * Brother-in-law by Missy
 * Nephew by Missy and her husband
 * Sister-in-Law: Amy Farrah Fowler