Forum:KB:How did Darth Vader learn Luke was his son?

Their are a lot of contradicting sources. First Vader interrogates Thurlow Harris who gives him the name, another pilot who jumps into an acid pit, Birra Seah in the new Star Wars series, and finally Lucas says Vader just asks Palpatine who tells him "Yeah he's your son". Its so confusing. Did they all tell him, and Vader just keeps asking?74.72.159.170 04:38, November 16, 2013 (UTC)