Except that in the original timline Jim Kirk already had an older brother named George — Jim calls him "Sam," but his full name is George Samuel Kirk.
http://en.memory-alpha.org/wiki/George_Samuel_Kirk
Quote:
George Samuel Kirk was the brother of Starfleet captain James T. Kirk. He was usually called George, but his brother always called him Sam.
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Sam was born in 2229, Jim in 2233.
(And that George Foreman business of giving all his sons the same first name is asinine, so no, that wouldn't happen.)