The Jedi apprentice rejected her grandfather and ultimately destroyed him with the help of Ben Solo and the spirits of the Jedi from the past, ending both Sidious and his goal of ruling a new Sith Empire for an eternity. During the Battle of Exegol, he attempted to convert his granddaughter to the dark side, telling Rey that it was her birthright to rule the galaxy as an empress and heir to the Palpatine bloodline. By then, his new fleet, the Final Order, was completed and ready to depart from Exegol.
In 35 ABY, Sidious announced his return to the galaxy at the time of the First Order-Resistance War. In 21 ABY, Sidious ordered his son's execution when he refused to give up his daughter, having sold Rey to Unkar Plutt on Jakku to ensure her safety. Unlike her father, Rey was Force-sensitive, and was therefore regarded as the ideal host for Sidious' spirit. The offspring of Sidious's cloned progeny, Rey was his biological granddaughter. During the New Republic Era, Rey was born in 15 ABY. One byproduct of the Sith cult's experiments was the Emperor's " son," a partially cloned strandcast engineered from his tissue samples and blood cells, who didn't inherit his progenitor's connection to the Force. Using the Emperor's genetic material, the Sith Eternal engineered various failed attempts to create a stronger host body. Through the dark side of the Force, he transferred his essence to a clone of his original body, although the new vessel proved unstable. Obsessed with eternal life, Sidious survived his first death in 4 ABY.
From then on Sidious ceased to live a double life the name of Palpatine was largely forgotten during the Imperial Era, and the galaxy came to know him simply as "the Emperor." In 19 BBY, Palpatine systematically exterminated the Jedi for treason before claiming the title of Galactic Emperor, transforming the Republic into the Galactic Empire. He was the mastermind behind the Invasion of Naboo, the Separatist Crisis, and the Clone Wars-conflicts designed to facilitate Palpatine's rise to power. The heir to Darth Bane's legacy, Sidious endeavored to finish the work of generations of Sith Lords by destroying their adversary, the Jedi Order, and restoring the Sith to power. Unbeknownst to the public, Palpatine was Darth Sidious, the Dark Lord of the Sith. During the Republic Era, Palpatine represented people of Naboo as a senator in the Galactic Senate prior to his election as Supreme Chancellor of the Galactic Republic in 32 BBY. A member of the family, Sheev Palpatine rose to prominence through galactic politics. The Palpatine family, also known as House Palpatine, was a dynastic noble human family originally from the planet Naboo in the Mid Rim Territories of the galaxy. The only family you have here… is me." ―Rey and Darth Sidious " Your Master, Luke Skywalker, was saved by his father. " All you want is for me to hate, but I won’t.