That's the only question I have, I'm not really bugged by the inclusion so much as I find it odd.
I am intrigued by the suggestion here that Annikan knew about Luke (but not Leia, wonder how that'd work out) and kept him secret from the Emporer, biding his time until his son came of age so he could turn him and overtake the Emporer. He just didn't expect the son to save him. I kinda hope that's layed out in the third one.