"Oh." He doesn't know what happened, but he's not unfamiliar with kids talking about their siblings or parents in the past tense, and he knows what that means. Granted, in his world, it was usually sickness or starvation that got them, rather than titans or warfare, but the end result was still the same: they were no longer there. He pauses a little, unsure if he's supposed to say anything else, then manages a curt; "Sorry."

He pouts a little when Galliard herds the fireflies toward him; part of him wants to insist that he doesn't need the help, but at the same time... him doing things by himself is honestly the default, has been for years at this point, and he can't deny that being babied a little bit feels nice. He thinks his mom would maybe do that, if she was here.

So in the end he doesn't say anything and his expression lightens up again as he quickly goes after the incoming fireflies, and soon the number in his jar has hopped up from one to five.