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I don't like how lucas changed the storyline for the original trilogy, in empire by having it hinted that vader knew all along about luke
and was hiding him from the emperor, until he was a grown man. This obviously means vader went to get Luke from the lars, and
when he found out he had gone off with kenobi he had uncle owen and aunt beru fried by the stormtroopers.
Couldn't it just be that after Luke both blew up the Death Star and fought him to recover the Kyber Crystal that Vader sort of put two and two together and realized Luke was his son, but did not tell the Empire because... Palps would want Luke to be his apprentice like in RotJ.