The Rise of Skywalker reveals the full truth about Rey's lineage of learning who her grandfather is and who her parents were.
The film very quickly shows a flashback (or Force vision) sequence of her parents and what happened to them, but nothing more.
Considering that Rey herself is Force-sensitive and that much of her power comes from being blood-related to
Darth Sidious/Emperor Palpatine
Does that mean that at least her father was Force-sensitive too? And also what about her mother? Or did it just skip a generation?