It's mostly just that he's caught off guard, a little startled, but it's still nice when the kid puts his hand on his shoulder and tries to ground him a bit. Klaus can't help but toss him a thankful little smile, and then it's settling in. He can see how it feels, written all over the kid's face, when he comments that they sound like strangers in a house with the same last name.

Klaus shakes his head, lifting a hand and pointing at the kid, "That's not true at all. I mean, things are tense, we lose touch, we scatter, but the minute we're all back in the room it's, well, mostly like things were back then. A little more aggressive, but we bicker and compete and Luther and Diego fight and the rest of us roll our eyes. Just because don't do Thanksgiving doesn't mean we're not family."

And maybe that's something the other siblings the kid has run into haven't told him yet, probably because Klaus is pretty sure he's the only one who'd admit it out loud.

The rest of it, about Dave, that's something he doesn't blame the kid for just saying 'oh' to. It's a lot to process. He might not have been able to process it before he spent 10 months in Vietnam with Dave.

Reaching out, he just squeezes at the kid's neck again, and smiles in a tired, fond, wasted sort of way.