it scared the hell out of him. That's why he keeps Luke on the farm. He doesn't really need Luke for "one more season". He's being protective.

I agree. But still, Lucas had no idea about that when he wrote and shot that scene. It plays out quite well in the end, and as much as I dislike Episode 2, I thought it was a good decision to insert the Lars in that way.

R2 is probably the only character in the entire saga that knows, more or less, the whole story.

Owen & Beru knew. Look at their faces when Luke mentions Obi-Wan. Owen makes it very clear that he is to stay away from "old Ben" because of what happened to Luke's father. "He has too much of hisany need as Vader wouldn't ever return to Tatooine. I think that Owen and Beru considered the Jedi very dangerous and foolhardy and figured Anakin died with the rest of the Jedi.

R2D2 obviously knew the whole story, and Bail Organa defiantly knew as well. After that it's murky. Tarkin pieced it together but was never certain. The attitude he displayed towards Vader in ANH certainly suggested he knew Vader was once a Jedi.

The Clone Wars suggests it. Tarkin seems like the type that would thoroughly investigate his command team. Especially Vader, whom the Emperor expects Tarkin to yield substantial power and authority. Most assume Vader is subservient to Tarkin, but I don't think it was that kind of arrangement at all. Tarkin was in command of the Death