“If I tell Rey how I brutally murdered her parents and ruined her entire life, she’ll definitely want to join me then!”
In the end Rey blames Palpatine for infecting and manipulating Kylo. Also the dark part of her hates her parents for abandoning her. Also she stabs Kylo— there’s always that.
But if you have your heart set on Rey’s dad being Palpy’s kid then my edit may not be your cup of tea.