[He answers evenly without much emotion at all; it's the truth, and he doesn't have much of an opinion on that or of his mother's obvious incredulity.]

It is, by decree of Supreme Leader.

[Seeing nothing strange about this, or about the idea that she might not know about Snoke, he moves right on ahead with the things that do stick out as strange to him.]

I'm surprised he brought it up. As if you could be convinced to stop calling me that.