[That uncertainty tells him enough, that maybe this guy doesn't know very much about the rest of his family, which paints a picture.]

It tends to be genetic. [He offers without prying into anything Dys might not want to talk about. Luckily that bout of melancholy seems to pass with the thought of talking about mutual twin sisters.]

[Dipper picks up his own mug, since honestly hot tea had sounded like a good idea.]

But that's cool. [Genuinely.] My name's Dipper, by the way. Sorry for not introducing myself yet. What's yours?