Sam gives a small laugh at the confirmation, but more how she says it than anything else. It's like being clocked as a tourist; not an insult, but still one of those things that feels like it might be, not that he's actually offended. "Give me another few days and I'll be right at home." He remarks, but it's half a joke still.

Ah, so she does know Dean, even if Sam can't quite read exactly how. He thinks it's safe to confirm the connection, though, and nods. "Yeah, he's my brother." He'd mention that Dean's older, but with the time weirdness, that's debatable and not worth getting into. Instead, he moves onto the inevitable followup question. "You know him?"