- This page details George Samuel Kirk, Jr. in the primary universe; for George Samuel Kirk, Jr. in the mirror universe see George Samuel Kirk, Jr. (mirror); for the George Samuel Kirk, Jr. in the Kelvin timeline created by Nero's temporal incursion see George Samuel Kirk, Jr. (alternate reality).
George Samuel "Sam" Kirk, Jr., the eldest son of Winona and George Samuel Kirk, Sr., and brother of James T. Kirk, was born on 12 August 2230. Unlike James, he was a scientist, a research biologist, and mainly worked and lived on the planet Deneva with his wife Aurelan and three sons Peter, Alexander, and Julius. (TOS novel: The Last Roundup, ST website: Startrek.com)
In the late 2240s, George was already an accomplished scientist, and spent some time on Ganjitsu where he and Winona became good friends with Hikaru Sulu and his parents Hosato Sulu and Shimizu Hana. (TOS novel: Enterprise: The First Adventure)
George traveled from colony to colony aboard an old Andorian merchant ship he owned, later sending for his family once he had established and set up their new home. (TOS eBooks: Mere Anarchy, Shadows of the Indignant)
Unfortunately, George and Aurelan died on Deneva in 2267, following the invasion of neural parasites. However, he was survived by his three sons. (TOS episode & Star Trek 2 novelization: Operation -- Annihilate!)