Quote:Original post by Boris KarloffQuote:GL commentaryLuke is Vader's hope. His motives at this point are purely evil. He simply wants to continue what he's been doing before, which is to get rid of the Emperor, and make himself Emperor. He only sees his son as a mechanism to further that ambition.
You can also tell during the scene with the Emperor's hologram: the Emperor mentions the son of Anakin Skywalker. Vader acts suprised to hear that he has a son, even though he already knows this (he says "I'm sure Skywalker is with them." earlier on). He had been looking for Luke the whole time so that they could team up and destroy the Emperor according to the "always two" rule. When the Emperor 'reveals' that Vader has a son, Vader doesn't fess up because then the Emperor would know Vader had been hiding something from him. Then, the Emperor wants Luke dead, but because Vader needs him, he suggests turning Luke to the Dark Side instead, supposedly as 'a powerful ally', but in secret so that the two younger Siths can overthrow the older.
I thought GL mentioned that Vader thought it was another Skywalker as if Skywalker was as common 'Smith'.