"No, Gannon is the original from NES.
Ganon is his second cousin, well, technically he's his uncle, but they're only three years apart.
Then you got Ganondorf, who is their great grandfather, but the thing is he's really just barely related because see he was stationed in Japan back in the war and while he was there he fell in love with Gannon's great grandmother, after the child was born they moved to Hyrule, but then the next war was starting, and they shipped Ganon's grandma to an internment camp, where she died of typhoid. It's really sad actually, a very dark spot in Hyrules history. I think they even omit it from the text books today"