In Return of the Jedi, audiences discover, as does Luke and Leia, that Luke and Leia are brother and sister! Gasp. Oh wait, it doesn't really matter. Is this Lucas's way of amazing his audience with family information, the way he did in The Empire Strikes Back? Of course. However, nothing could have been as startling and life-altering as the news that Darth Vader is Luke's father, short of discovering that the Emperor is Luke's mother, (the Emperor is, as we know, played by a woman, after all.)
Nice try, Lucas. But stop adding stupid elements that only confound the rest of the series. Now instead of "Oooh they kissed." We're shouting, "Ewe, they kissed!" And the series has an entirely different flare to it, one that is nasty!
(And while I'm at it, Lucas, stop calling me whenever you need a ride someplace!)