Forum:KB:Does Vader ever realize Leia is his daughter?

So, my best friend and I were discussing Star Wars, and we realized something very odd—although Darth Vader is aware of the fact that he has a daughter, no one ever tells him who she is. Obviously he is aware of Luke being his son, and when he dies, he tells Luke, "Tell your sister you were right." I know that Vader not being able to sense that Luke and Leia were his children during his first encounter with them in the films was always a big debate among fans, but obviously at some point or another, he and Palpatine realized that at least one of his children survived. But I wondered if there was anything canon that actually answered this specifically. Thanks! — Adele Addict (talk) 20:14, July 12, 2016 (UTC)