There have been a lot of questions about Rey's parents ever since she was first introduced in The Force Awakens. After The Rise of Skywalker was released, even more questions popped up. So Palpatine had kids?

The common thoughts were that Palpatine hooked up with Sly Moore. She can be seen next to Palpatine in a few scenes in the movies.

Well, the novelization of The Rise of Skywalker is answering a lot of questions that the movie did not. Apparently, Rey's father was a failed clone of Palpatine. The book goes into detail about how Palpatine survived after Return of the Jedi.

Here are some quotes from the book:

Emperor Palpatine lived, after a fashion, and Kylo could feel in his very bones that this clone body sheltered the Emperor's actual spirit.

So the Palpatine we see in Rise of Skywalker is technically Palpatine's spirit in a clone body. So what about Rey's father?

One genetic strandcast lived. Thrived even. A not-quite-identical clone. His 'son.' ... But he was a useless, powerful failure ... Palpatine could not even bear to look upon such disappointing ordinariness. The boy's only worth would lay in continuing the bloodline through more natural methods.

While it doesn't go into exact detail, it's believed that this failed clone ends up becoming Rey's father.