Via ScreenRant.com (not much to spoil, but does contain speculation)
Rey’s parents may not be important in Star Wars: The Rise of Skywalker – but where she’s come from may be far more significant. Rey was introduced as something of a mystery character in Star Wars: The Force Awakens, and from the outset, it was clear her backstory would be important to the Sequel Trilogy in some way. The Star Wars Saga has always been a generational story, and as a result, viewers speculated she could be tied to Force-users of the past, ranging from Luke Skywalker to Palpatine himself.
Writer/director Rian Johnson decided to subvert these expectations in Star Wars: The Last Jedi. In one powerful scene, Kylo Ren forced Rey to confront the brutal truth about her parents. According to Rey’s greatest frenemy, her parents were drunken nobodies who sold their own daughter off for drinking money and abandoned her on Jakku. He’d learned this because of the unique Force bond he shared with Rey, which allowed Kylo Ren to peer into the depths of her subconscious and recognize the truths Rey was unable to admit to herself.
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