[Claire's too young to consider herself a mother. Not at nineteen. Caretaker just feels like the right word, and Sherry is ferociously capable on her own.]

It'd...be hard, I think. I admit I struggled a bit, at first. But she'll be fine.

[She will make sure of that.]

And yeah, I think that's part of it. Who better to save the universe than the people who survive.