Papyrus looks up the moment he hears a voice above him, and takes a couple reflexive steps back when he sees it's a spider. Much less one that's mentioning his brother and asking him about it. This is almost exactly a conversation he didn't want to have.

"That... You're right, about the first question." Not that Umab is his brother's name, but maybe Armaros doesn't need to know that, yet. "However... We're not fae! We're just... working with one? And the fae-ness rubs off on you, a little."