Here’s another variation where Palpatine doesn’t know where Rey is, and waits for the force to awaken in her, revealing herself to him. This also works for Anakin, as you could say that through the force, Qui gon and Obi Wan found him, revealing Anakin to Palpatine. I removed her parents completely and in this version Palpatine doesn’t create Anakin, but that’s just preference and you could easily reinsert the lines that communicate that. This works best with TFA Starlight and Rey’s sith eyes in that moment.
“I pushed you in the desert because I needed to see it… I needed you to see it… who you are. The dark side is in your nature, Rey…”
“You’re lying.”
“I’d never lie to you… your parents were no one. Junk traders expecting a child they never planned for.”
“Don’t!”
“Your father had no part in your conception.”
“I don’t want this!”
“…just like Vader.”
“No!”
“You see it, too, don’t you? The throne.”
(Rey sees a flash of the vision of herself on the Sith throne)
“Your family feared you. The same way Skywalker feared me.”
“Stop talking.”
“But they didn’t know you like I do.”
(Cutaway to heroes capture)
“Palpatine knew your true potential… your power. The first time we fought, in the forest, the darkness inside of you awakened. You revealed yourself to the emperor that day… just as he planned."
(Visions of Rey beating Kylo on Starkiller, falling into the dark cave, etc.)
“No!”
(The mask of Vader falls to the ground)
“So that’s where you are.”
“Before you chose the Jedi, Palpatine wanted you. I’ll come tell you why.”
“Rey… I know the rest of your story.”
“Tell me.”
“Because he manipulated the dark side of the Force itself into creating life. You’re his creation, his chosen heir. You, are a Palpatine.”
"The Emperor wants us to fight each other so the strongest may take the throne. But what he doesn’t know is that we’re a dyad in the Force, Rey… two, that are one. We’ll kill him, and finish what Vader started, together…”