[ Rey has come to her own conclusions about Vader that have a lot to do with her own experience with Kylo, but now isn't the time to get any more twisted up in the overall Skywalker mess. Luke has to work things out with both of them on his own, without her trying to defend either of them too hard. She knows it because she'd feel the same. ]

I shouldn't have doubted you.

[ She manages a tentative -- but genuine, this time -- half-smile. She supposes it is fitting that they both learned a world-altering truth about their family in this place where it's possible to at least sit down and try to untangle some of it together. ]

I wonder if Leia knew, back home -- or if you did. It's something your father sensed about me, but Kylo didn't know until he heard it straight from Palpatine himself.

[ She can't help but shudder faintly at the idea of the man. He must be positively ancient by now, yet still powerful enough to remain in hiding and gather resources, to reach out in the Force and try to tempt her to the Sith throne in her dreams. ]