Title: Jedi
Content:  Leia Organa was the daughter of Anakin Skywalker and Padmé Amidala, the twin sister of Luke Skywalker, and one of the main characters of the original and sequel trilogies. While Force-sensitive, she didn't become aware of her connection to the Force or her lineage until much later in life, instead of focusing on a career as a senator and, secretly, a leader of the Rebel Alliance. As seen in The Rise of Skywalker, Leia began training as a Jedi under her brother shortly after Return of the Jedi, but quit her training when she had a vision that it would result in the death of her yet to be born son. Decades later, while leading the Resistance against the First Order, Leia also briefly mentored Rey in the ways of the Force, despite her limited knowledge about it. Ultimately, Leia gave her life to redeem her son, Ben Solo, who had turned to the dark side, and became one with the Force. Later, she and Luke gave Rey their blessings to adopt the Skywalker surname and continue their family's legacy.
Title: Skywalker family
Content:  that Princess Leia Organa is his sister. In The Force Awakens, as the last known Jedi, Luke is in hiding after failing to prevent his nephew and apprentice Ben Solo (now Kylo Ren) from turning to the dark side to join Supreme Leader Snoke and has cut himself off from the Force. In The Last Jedi, a young scavenger named Rey has located Luke and tries to convince him to show her the ways of the Force, but he refuses. After knowing the death of Han Solo, he trains Rey about how to use the Force and to become a Jedi. Luke reveals to Rey that he sensed the dark side in Ben and was scared for him, but Ben 
Title: Padmé Amidala
Content:  to Luke that he has a twin sister. She and their mother were "sent to the protection of friends in a distant system. The mother died shortly thereafter, and Luke's sister was adopted by Ben's friends, the governor of Alderaan and his wife." Lucas is quoted as saying: "The part that I never really developed is the death of Luke and Leia's mother. I had a backstory for her in earlier drafts, but it basically didn't survive. When I got to Jedi, I wanted one of the kids to have some kind of memory of her because she will be a key figure in the new episodes I'm writing. But I really debated whether or not Leia should remember her." When Lucas drafted the script for The Phantom Menace, he 
Title: Luke Skywalker
Content:  In the prequel film Revenge of the Sith (2005), during the waning days of the Clone Wars between the Galactic Republic and the Separatists, Senator Padmé Amidala, wife of Jedi Knight Anakin Skywalker, becomes pregnant with Luke and Leia. Anakin has a prophetic vision of Padmé dying in childbirth, and allows Chancellor Palpatine - secretly the Sith lord Darth Sidious - to corrupt him to the dark side as Darth Vader. After Vader uses the dark side to choke her, Padmé is taken to Polis Massa, where she gives birth to Luke and Leia and dies, having lost the will to live after Vader'a betrayal. Obi-Wan and Yoda agree to separate the twins in order to protect them from the Sith and the newly created Galactic Empire. Obi-Wan takes Luke to the desert planet Tatooine, where he is adopted by Vader's stepbrother, Owen Lars, and his wife, Beru, while Leia is adopted by Senator Bail Organa of Alderaan. The infant Luke is portrayed by Aidan Barton, the son of Roger Barton, an editor of the film.
Title: Princess Leia
Content:  length) for the score of the 1977 film. The second draft of the Return of the Jedi screenplay contained dialogue in which Obi-Wan tells Luke he has a twin sister. She and their mother were "sent to the protection of friends in a distant system. The mother died shortly thereafter, and Luke's sister was adopted by Ben's friends, the governor of Alderaan and his wife." Fisher explained in 1983: "Leia's real father left her mother when she was pregnant, so her mother married this King Organa. I was adopted and grew up set apart from other people because I was a princess."
Title: Skywalker family
Content:  the stepmother of Owen. Shmi later dies. Owen tells Anakin they are stepbrothers and later marries Beru Whitesun. Anakin secretly marries Naboo Senator Padmé Amidala at the end of the film. In Star Wars: Episode III – Revenge of the Sith (2005), Padme dies giving birth to twins, Luke and Leia. Luke is raised by Beru and Owen Lars on Tatooine. Leia is raised by Senator Bail Organa and Queen Breha Organa on Alderaan. Anakin, who has since become the Sith Lord Darth Vader, is unaware of his children's birth. The twins soon became part of the Rebel Alliance following the deaths of their adoptive families 
Title: Skywalker family
Content:  in the war against the Empire, forming a romantic relationship with Leia. Eventually, Han, Anakin (who has now reformed), Luke, and Leia succeeded in putting in end to the Empire's reign of terror, but this came at a cost of Anakin's life. In the 2015 film Star Wars: Episode VII – The Force Awakens, it is revealed that Han had a son named Ben with Leia. The family breaks apart following Ben's descent into the dark side as Kylo Ren, with Leia and Han separating. Luke is not revealed to have any children. At the end of Star Wars: Episode IX – The Rise of Skywalker 
Title: Star Wars sequel trilogy
Content:  After finding Luke Skywalker in self-imposed exile, Rey attempts to convince him to teach her the ways of the Force. She also seeks answers about her past and the conflict between Luke and his nephew Ben Solo (now Kylo Ren). Unbeknownst to Luke, Rey starts using the Force to communicate with Kylo. Meanwhile, Leia leads the Resistance as they are pursued by the First Order, led by Supreme Leader Snoke. Rey leaves Luke in an attempt to redeem Kylo and achieve peace. After Kylo kills Snoke, Rey is forced to choose between ruling the galaxy with him, or helping the outnumbered Resistance survive. On November 20, 2012, The Hollywood Reporter reported that Lawrence 
Title: Princess Leia
Content:  to rescue Han from the crime lord Jabba the Hutt and is revealed to be Vader's daughter and the twin sister of Luke Skywalker. The prequel film Revenge of the Sith (2005) establishes that the twins' mother is Senator (and former queen) Padmé Amidala of Naboo, who dies after childbirth, while their father is none other than former Jedi Knight Anakin Skywalker, who would become Darth Vader. Leia is adopted by Senator Bail and Queen Breha Organa of Alderaan. In the sequel trilogy, Leia is the founder and General of the Resistance against the First Order. She and Han have a son 
Title: Skywalker family
Content:  Luke Skywalker (portrayed by Mark Hamill) is the brother of Leia Organa, the brother-in-law of Han Solo, the uncle of Ben Solo, the son of Anakin Skywalker and Padmé Amidala, and the grandson of Shmi Skywalker. He is taken in by his uncle and aunt, Owen and Beru Lars, after the death of Padmé and Anakin's fall to the dark side. He is Force-sensitive and skilled with a lightsaber. In Return of the Jedi, a dying Yoda confirms to Luke, that Darth Vader (previously Anakin Skywalker) is actually his father, despite Luke's belief that Vader's claim to fatherhood in The Empire Strikes Back was a ruse to pull Luke to the dark side. He also finds out from Obi-Wan's Force 

Question: when do we find out luke and leia are siblings?
Answer: Return of the Jedi.
In Return of the Jedi.