when Darth Vader and also Princess Leia fulfill on board the Tantive IV in Star wars Episode IV: A brand-new Hope because that the an initial time, go Darth Vader understand she\"s his daughter?


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Chad: That's a very great point. Ns think it's cleared up then the Darth Vader didn't understand Leia even existed before ROTJ, however Yoda's quote \"No. Over there is another\" has constantly confused me. One of two people in ESB that was currently known the Leia would be revealed together Luke's sister, or they're talking about someone else. I uncover the before be an ext believable.

No.

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At that allude he doesn\"t even know Luke is his son and also that\"s what start his attention in detect \"Young Skywalker.\"

He shows his surprised at learning that Luke has actually a sister in Return of the Jedi as soon as he says he watch Luke\"s feeling are strong for his friend – climate adds, in surprise, \"Sister.\"

Wookieepedia says (when relenten the duel between Luke and Vader top top the new Death Star):

Vader, who had actually been research Luke\"s thoughts, discovered that besides Luke he additionally had a daughter: Leia Organa

However, no attribution because that this assertion is given in the article.


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To re-use component of mine answer come an unrelated inquiry Why carry out we hear Leia's Theme during Kenobi's death?:

At the moment of functioning of \"A brand-new Hope\" (e.g. Prior to 1977) - it was NOT well-known to anyone (including Lucas) the Luke and Leia space family. Since Luke was Anakin Skywalker\"s boy from the start of ANH, that means Leia wasn\"t supposed to be his daughter, until at least mid-work on illustration V.

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To be much more specific, even an early Leigh Brackett\"s 1978 breeze of \"The realm Strikes Back\" didn\"t have actually that relationship developed yet - it was introduced later (source).

Another related evidence for Luke and Leia not yet being associated was 1978 pre-ESB book that was a sequel to \"ANH\" - Alan Dean Foster\"s \"Splinter that the Mind\"s Eye\". It creates the theme of romantic interest between the two (presumably, in part, since Foster and also Lucas didn\"t recognize if ANH would certainly be a big hit and also if Harrison Ford would certainly be interested in the sequel should the sequel be based on \"Splinter\")