Let’s combine a couple things:

(By the way there is plenty of non-speaking space in the first paragraph here so I wouldn’t worry about what’s below being too long).

“Because clones are flawed hosts. He influenced the Force to create two dark bloodlines. My grandfather’s. Then, perfected with you. You… are Palpatine’s heir.”

“Created to inherit the throne of the Sith, he sees you as a true Palpatine. But what he doesn’t know is that we’ve become a dyad in the Force, Rey… two, linked by the power our families share. We can end him and the Sith, and create something new, together…”

EDIT: Also, if we wanted to we could shorten the last part and have “dyad in the Force” only be mentioned by Palpatine later on:

“Created to inherit the throne of the Sith, he sees you as a true Palpatine. But what he doesn’t know is that we’ve become linked by the power our families share, Rey. We can end him and the Sith, finishing what my grandfather started, together…”