Lucas has said that he knew Vader was Luke's father while writing the first film, though the relationship is not explicitly evidenced before said draft of The Empire Strikes Back.
When the original 1977 Star Wars was made, did George Lucas already know that Darth Vader was going to be the father of Luke and Leia? No. As late as the first draft of ESB, written by Leigh Brackett, Anakin and Vader were completely separate people.
Did the actors know Darth Vader was Luke's father?
The Iconic 'Father' Twist in Star Wars Was So Secret Even the Cast Didn't Know It Until the Premiere. Mark Hamill explained how he and George Lucas hid the massive Darth Vader reveal in 'Empire Strikes Back.
R2-D2 was present when Padmé gave birth to Leia and Luke, so he knew Luke was Anakin's son – but what he didn't know was that Anakin became Darth Vader. In addition to that, Anakin's fall was surely a painful event in R2-D2's life, one that he definitely wouldn't like to remember or even talk about.
George Lucas Explains Anakin Skywalker and Order 66 in 1980's Interview
Does KYLO Ren know Darth Vader is his grandfather?
Kylo Ren was always obsessed with his grandfather. He didn't learn he was the grandson of Darth Vader until he was a teenager, when a recording from Bail Organa - intended to be a private message for Leia - was shared with the entire galaxy.
Vader was hunting down the pilot who blew up the Death Star, and hired Boba Fett to find them. Boba was unable to, but he did give Vader a name: “Skywalker.” This, combined with his knowing Luke was Force-sensitive and had been trained by Obi-Wan, was what made him realize the truth.
in the Dark Horse comic series star Wars Tales, which is now part of legends, it's revealed that Darth Vader did recognize C. 3PO on Cloud City. when 3PO was shot by Stormtroopers, his parts were brought before Vader. because the Imperials thought he could hold valuable.
Did Leia ever find out Darth Vader was her father?
That was until Luke Skywalker told her the truth - that he was the son of Darth Vader, and that she was his sister. "It won't be easy for you to hear it, but you must," Luke told Leia before he revealed his secrets to her.
Returning to Dagobah to complete his training, an ailing Yoda told Luke the terrible truth that Vader was his father, Anakin Skywalker. Rather than destroy his father, Luke sought to bring him back into the light. At 900 years old, Yoda passed away, telling Luke that there was another Skywalker.
'Darth Wyrm' would fit with Sith tradition, and its original meaning - an archaic term for 'dragon' - would properly convey Luke's incredible power, and even has some poetic meaning as the inversion of the Jedi 'knight' he could otherwise have been.
It's an open secret that Palpatine was disappointed with Darth Vader; he thought he was getting the Chosen One, a force of nature who could not be beaten, and yet Darth Vader was defeated the moment he crossed blades with an adult Jedi.
Summary. Darth Vader's failure to recognize Leia as his daughter in Star Wars: A New Hope stems from George Lucas's late decision to make Luke and Leia siblings. Leia's Force abilities and her lack of awareness of her true identity also contributed to Vader's inability to sense their familial connection.
Bail Organa was present during the climactic end of Star Wars: Episode III - Revenge of the Sith, and there can be no doubt he was aware of Darth Vader's true identity.
To answer the original question, I'm pretty sure that R2 never knew that Anakin became Vader. He wasn't there when Anakin was named Vader, he didn't know what happened on Mustafar. All he knew is that Anakin told R2 to stay with the ship, and that was the last time R2 saw Anakin.
She senses Anakin when she reaches out to the pilot — and Vader realizes that Ahsoka, his former Padawan, lives on. In Season 2, Episode 18, “Shroud of Darkness,” Ahsoka's guilt manifests as a vision of Anakin, who's angry with her for leaving him all those years ago.
You saw how Luke's attitude completely changed when he realised that was actually Yoda and so did Yoda's behaviour. As for the r2 thing, is incredibly likely he just suspected R2 had had his memory wiped several times since they last saw each other.
Within Vader still resides a part of his former self, Anakin Skywalker, and it could be argued that this is why he can sense Luke while the Emperor cannot.
Instead of being in the life suit, Vader looks like an older Anakin who never received the devastating injuries, and Padmé and Luke (who struck down Palpatine) are by his side. It's during these visions Palpatine realizes Luke - who he only knew as the Rebel who destroyed the Death Star - is Anakin's son.
The two recognize Luke's similarities to Anakin and try to prevent him from sharing his father's fate, but they let him remain Luke Skywalker instead of having him go by Luke Lars out of respect for his grandmother, Shmi Skywalker.
