[Obi-Wan considered this for a moment. He wasn't entirely sure of specifics at this point, but he didn't want to discourage Leia from trying.]

You are his mother. I'm certain there are ways you can reach him no one else can. Your death, I think, profoundly affected him.

[He knew Kylo Ren cared about her, no matter how much he tried to hide his affections and attachments to people. He had seen it when the young man's end was near.]