In The Rise of Skywalker, it is revealed
Rey is Palpatine's granddaughter.
Then who would be Palpatine's wife? I have watched all of the movies and have never heard anything about this.
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Rey's father Dathan is a clone of Palpatine. He was made in a cloning chamber. There is, by definition, no mother. There are, however, indications that Palpatine may have included foreign DNA in order to try to make his clone a more compatible recipient for his Force essence.
Anaximander studied the three-dimensional image of Dathan’s face. “He’s a clone?”
“Subject three lacks genetic signatures of accelerated growth. He is thirty-three standard years of age, but analysis shows he is a hybrid strandcast.”
Anaximander shook his head. “Explain.”
“The strandcast is not a direct cloned replicate of the donor, but is nonetheless created from an engineered template.”