Rey's father is Dathan, a failed clone of Emperor Palpatine, making Rey the granddaughter of Darth Sidious; Dathan and his wife, Miramir, hid Rey on Jakku to protect her, but were later killed by Palpatine's assassin, Ochi, to retrieve her for the Sith Eternal's plans.
Despite her commitment to the Jedi Order and the light side of the Force, Rey felt the pull to the dark side due to her anger as well as the adversarial relationship she had with Ben Solo, a fallen Jedi who joined the First Order as a warrior named Kylo Ren; they shared a unique bond as a dyad in the Force.
Rey's father, Dathan, was not Palpatine's son in the traditional sense but rather a clone derived from his genetic material. Designed to be a vessel for the Emperor's essence, Dathan lacked the Force potential necessary to carry out this purpose.
Rey's father is a genetic clone of Emperor Palpatine/Darth Sidious; Rey's grandfather is Emperor Palpatine/Darth Sidious. Rey is trained by both Jedi Master Luke Skywalker and Resistance General Leia Organa; she shares a close personal, almost daughterly connection with the latter.
Rey is Anakin's half sister, and Palpatines relations to Rey through the force. Rey is a genetic experiment/force experiment of immaculate conception orchestrated by palpatine. So Rey is Palpatines daughter or grand daughter, in a metaphorical sense. The same way Anakin is Palpatines son through the force.
Palpatine Saw Rey As A Tool, Not A Granddaughter
Kylo Ren idolized his grandfather Darth Vader, but Rey never saw Palpatine in this way, never even acknowledging her familial connection to The Emperor as anything beyond a genetic technicality. For his part, Palpatine didn't really think of Rey as family either.
No, Darth Plagueis is not Anakin Skywalker's father; Anakin had no biological father, being born of the Force itself in response to Plagueis's dark side manipulations, with Palpatine's tales of Plagueis's power over life being a manipulation to turn Anakin to the dark side, though Plagueis's attempts to create life did inadvertently cause Anakin's conception.
Likely unaware of his true nature, Snoke was an artificial genetic strandcast created on the planet Exegol by the resurgent Dark Lord of the Sith and Galactic Emperor Darth Sidious as a proxy and the product of cloning experiments.
Zayne, son of Rey Palpatine and Ben Solo, was born shortly before Exegol. In 34 ABY, Padawan Rey Palpatine and Dark apprentice Kylo Ren were among those who fought in the First Order-Resistance war in a decisive battle for the galaxy at the Battle of Crait.
Luke was the last Jedi, then. Rey is the last Jedi, now. The title of each film in the sequel trilogy is a direct reference to the main protagonist of the sequel trilogy, Rey. In the Force awakens, it awakens in her.
Why Do You Think Kylo Ren Was So Obsessed With Rey? He saw her as a useful tool for his rise to power. He was intrigued by the mystery surrounding her. He wanted closure for his defeat at her hands.
NO. Rey should not be related to anyone but the Skywalker family. This means Rey cannot be related to nobodies, Obi-Wan, Darth Sidious, or basically anyone who isn't a real, biological Skywalker. The core Star Wars films are part of the "Skywalker saga", which mainly focuses on the Skywalker family (by blood).
Palpy was stronger with the force, absolutely. But Yoda was the better duelist. Hence why he forced a sword fight vs a force fight. It could have gone either way depending on the circumstances, but the fact that Palpy kept keeping distance is the only reason he won.
As she explained in the holocron's voice message, Rey became a Skywalker to show her respect for the people who made her who she is, namely Luke Skywalker, Leia Organa, and Ben Solo. "Luke Skywalker was my Master. So was his sister, Leia, and her son, Ben, gave his life for me.
"Not from a Jedi." Sidious remembered Plagueis as a powerful Sith who discovered the ability to achieve immortality.
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.
Qimir has already been calling himself Darth Venamis, and is ready to officially be a Sith Lord Apprentice, but, is also already conspiring to get a pupil of his own, & eventually kill his own master as well.
"She isn't on Jakku. She's gone." Rey's parents left her on Jakku to prevent Darth Sidious from finding her. The Emperor intended to transfer his spirit to his granddaughter's body, leaving the unstable cloned body that could not sustain his power in the dark side of the Force.
Anakin Skywalker, once the prophesied Chosen One, fell to the dark side through fear, pride, loss, and manipulation. His bond with Padmé, mistrust of the Jedi Council, and belief in Palpatine's promises led to his tragic transformation into Darth Vader.