darth-sinister: Padme died and was made to appear to be still pregnant. Thus Vader thought his child was dead. If he knew about his child, he wouldn't have waited so long to find and convert him. Exactly. 'We' - besides those who don't think 'Padme dead' = 'Child dead' - are saying that he didn't know about him until after the Battle of Yavin..... There's any number of potential Force users. 'Any number' who would happen to have Skywalker as a surname? He only knew that Obi-Wan was there with the crew of the Millenium Falcon. As if Obi-Wan being there wasn't enough? And Vader didn't know where the Stormtroopers traced the droids to. True. But he could have found out 'where' after the B.O.Y... And even if he did, that doesn't automatically make it his kid. They could've named him Skywalker after Shmi. Well, that's original. Better than "he was a Rebel who was infatuated with the Legend of Anakin Skywalker"........ Lucas said this at the end of the duel on the commentary. That Lucas says this quote at this point, doesn't neccessarily mean that it's at this point that Vader is sure. What 'tips' Vader off? Luke's hair and eyes? He's not sure at first, which is part of the reason he's obsessed with finding Luke. Couldn't Vader be 'obsessed' because he knows that this Rebel pilot, named Skywalker, is his supposedly dead child? Once he knows, he makes his full plan to turn the boy and kill Palpatine. You mean that plan wasn't there when he spoke with the Emperor via hologram earlier? Again, what makes Vader 'sure' on Bespin? Luke's 'looks'?