There's no mention in Velleius, as I recall, re: Caeasar supposedly siring Brutus on Servilia, and as he would have to be about 16 years old to have done it, it's impossible. And Velleius is by far the closest biographer to Caesar's own time (?50-60 years later). I find it more interesting to ponder WHY legend should go that way over the 100-plus years between Caesar's death and Plutarch and Suetonius. I have this theory that real historical truth only lasts five generations, at most - after 100 years, you're in the realms of legend. And - given Caesar's known love for Brutus (and that's emphasized in several current AND later sources) and Brutus' leadership of the murder conspiracy, I think it was just toooooo much for some gossipy later historian to resist, to create the "Brutus was Caesar's son rumors" thing wholesale.

Yet we haven't discussed much, here, about the post peculiar feature of all this - why did Caesar love Brutus so much??