when does luke and leia find out they're twins
Princess Leia Princess Leia Organa of Alderaan (also Senator Leia Organa or General Leia Organa) is a fictional character in the Star Wars franchise, portrayed in films by Carrie Fisher. Introduced in the original Star Wars film in 1977, Leia is princess of the planet Alderaan, a member of the Imperial Senate and an agent of the Rebel Alliance. She thwarts the sinister Sith Lord Darth Vader and helps bring about the destruction of the Empire's cataclysmic superweapon, the Death Star. In The Empire Strikes Back (1980), Leia commands a Rebel base and evades Vader as she falls in love with the smuggler, Han Solo. In Return of the Jedi (1983), Leia leads the operation 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. Leia is adopted by Senator Bail and Queen Breha Organa of Alderaan. In The Force Awakens (2015) and The Last Jedi (2017), Leia is the founder and General of the Resistance against the First Order. She and Han have a son named Ben, who adopted the name Kylo Ren after turning to the dark side of the Force.
The Empire Strikes Back Vader intends to hold Luke in suspended animation via carbon freezing and selects Han to be frozen as a test subject. Han survives the process and is given to Fett, who intends to deliver Han to Jabba the Hutt. Lando initiates an escape and frees Leia and the others, but they are too late to stop Fett from departing with Han. They fight their way back to the Falcon and flee Cloud City. Meanwhile, Luke arrives at Cloud City and engages with Vader in a lightsaber duel that leads them over the city's central air shaft. Vader severs Luke's right hand, disarming him; when Luke refuses to join Vader against the Emperor, accusing him of murdering his father, Vader reveals that he, in fact, is his father. Horrified by the truth, Luke intentionally falls into the air shaft and is ejected beneath the floating city, where he grabs onto an antenna. He makes a telepathic plea to Leia, who senses it and persuades Lando to return for him in the Falcon. After Luke is brought on board, they are chased by TIE fighters and Vader on his star destroyer, but R2-D2 reactivates the Falcon's hyperdrive, allowing them to escape.