If anything, he's grateful that she doesn't question it. Most siblings might have said it before now, or assumed they didn't have to. He figures Allison can go ahead and let the others know, because he doesn't have the time. Yes, he has them back, but it's all temporary unless he changes history. He's the anomaly in the timeline. It's all on him.

"At least one of you can stay on task." Even when that task is 'don't get into trouble and wait patiently for him to tell them what to do.' It sounds simple, but with his family, it's obviously extremely difficult.

Still. He's glad he had a moment with Allison. He does better at handling them one at a time, he decides. Easier to be understood, even if they can't really. His gaze travels to the window. He's already exhausted, but he can rest when all this is over with. Permanently or otherwise.

"You should get some sleep." It's more of a goodbye than he usually offers. Maybe he's just buying himself a few extra seconds. "One of us should."