These are very interesting ideas! As I've posted earlier, I like the idea of the Clone Wars being caused by the distrust and confusion created by clones infiltrating society and being used as spies and assassins. These ideas are so much more interesting than what Luca$h provided, I think!

The idea of the original and clone Anakins siring a child each by two different women is an interesting spin to put on things! You could follow that train of thought to say that Luke might be the only person who senses his sibling. Ben and everyone else could be oblivious to the existence of another child. The mother could go to the other side of the galaxy before the child is born and then they stay hidden until Luke tracks them down. But what would happen to Luke's mother for him to end up with no memory of her and living with Owen and Beru?