User blog comment:Morganaforever/Are Arthur and Morgana siblings after all?/@comment-5036924-20120105204905/@comment-5036924-20120105220309

...I think it's more than likely that we both just desperately want to avoid the sibling thing :P

Depending on how long Gorlois was away, the child could still be his. And if Vivienne had one affair, why not multiple? Ha.

I think perhaps Arthur takes after Ygraine far more than Uther in terms of personality, but I don't think he's nothing like him. He has the same temper, the same desire to do what's best for Camelot, the same talent in battle. He's simply not had the same emotional scarring as Uther, which makes him seem a better person than his father. Uther, presumably, was quite tolerant before Ygraine died, but became this paranoid, tyrannical figure before the series started which is why he seems so different from Arthur. I think, as Morgana claims, they're not so different.

I think Uther, Arthur and Morgana all have the same potential to be good rulers. They're all so impassioned and so desperate to do what they think is best, even if it's not necessarily what most people would think is best. It just so happens that Arthur's landed on the good side of the fence while the other two fell onto a difficult, painful side which leads to their corruption.

I doubt Nimueh had the power to actually meld Arthur into whatever she wanted him to be; if she was so set on being rid of Uther by having his son be nothing like him then why not just kill Uther? She clearly had the power. And Uther would not have been seen as such a bad king by magic-users at that point since he was not yet persecuting them. No, I think Arthur is just naturally the best of both his parents, and even Nimueh could not have predicted everything he would become.

I get what you're saying, though, and it IS feasible. I wouldn't mind for that to actually happen because any way of removing the sibling thing works for me ;)