Obviously besides being a major plot component, why couldn't Vader when in front of Leia sense that Leia was his biological daughter?
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7because of plot holes :-)– Josiah HesterMar 5 '13 at 2:07
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6Possibly because she didn't know? He found out by reading Luke's feelings, and Luke knew.– KevinMar 5 '13 at 2:37
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2Related but not a duplicate: scifi.stackexchange.com/questions/6935/…– NominSimMar 5 '13 at 3:38
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4Vader simply had no idea that he had children. That's why Lucas put in that scene in the remastered Empire Strikes Back where the emperor tells Vader that Luke is Anakin's son.– Mr ListerMar 5 '13 at 8:03
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1@Kevin That's not how force sensitivity works..– I' RobotMar 5 '13 at 12:47
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Vader was able to detect Luke only after he received training in the use of the Force. Luke grew up a typical angsty and restless young man, zooming around on his landspeeder bullseyeing womp rats with preternatural ability, while attracting no attention from Vader or the Emperor. Since, as far as we saw in the movies, Leia received no Force-training, she too would have gone unnoticed by Force sensitive persons.
answered Mar 5 '13 at 7:18
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@PaulD.Waite Do you have any canonical source to say blood-relationship has something to do with force presence sensing?– I' RobotMar 5 '13 at 13:59
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11@SachinShekhar: ah - no, I was just making a crude joke based on the double entendre of "feel each other with force". Mar 5 '13 at 14:24
It's a continuity trap. Orginally not only were Vader and Anakin Skywalker different men, Luke and Leia were not siblings and in fact were to become a couple. It was in part how Han Solo became the breakout character that influenced mid-course continuity change.
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1If you want to post an out of universe answer that is basically "this is a plot hole", it would be better to at least make it comprehensive, showing proof that this was the plan from earlier drafts etc.... Dec 29 '15 at 14:34
Anakin's "force" was felt despite being a child with no training, so Luke and Leia's should also have been felt.
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There's a difference between detecting a generic Force presence and detecting the Force presence of a particular person.– Null ♦Aug 25 '15 at 2:58