Jedi Master Deboo Jade

So if you have HBO then you know that at almost anytime during the day you can catch Return of the Jedi. After watching it serveral times, I started to think of something "I think" would have been cool if they had not reveal Leia as the other Skywalker.
Instead, Yoda would reveal to Luke there is another Skywalker, however he would not have figured out who at this point. He would have the knowledge of another. When he battles Vader, again he can still retaliate when Vader suggest that perhaps this other Skywalker would turn to the darkside.

Then comes Revenge of the Sith, where at the end Padme names the babies and it is there we find out that Leia is the other Skywalker. I think that would have been kinda cool.

Now, if Vader had really wanted Luke to turn to the darkside, he could have used a similar line that he used in Empire.

Here is the scene(ROTJ), Luke is refusing to fight( instead of Vader saying perhaps his sister will turn to the darkside) Vader says" Obi-Wan never told you what happened to your mother,I killed her" ( from his point of view of course). I think Luke would have turned to the darkside with that one.

So this is what happens when HBO plays too much Jedi.