amp316 said:
I don't know. I think that he would be able to know who she is since Jedi/Sith have visions of the future.
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Not sure how powerful future sense is. The Jedi had no idea who Palpatine really was yet many of them met him on numerous occasions for example and many were unsure about Anakin even if they knew he could do good. If Leia shows no signs of using the force, reading her future might be pointless and wouldn't show parentage for certain, just might show a relationship of closeness to Luke that that might not mean brother, could just be friend.
This said, at the time, why would Vader bother? He just invaded a ship, got the princess and told his men to 'Take her away.' He didn't mind read her at any time to find out the based of the rebels, so direct future reading doesn't seem possible, just feelings.