"Cab. Then... I don't know. Eh Katie and Billy should go back home. Your mom and dad will be worried for sure. And if you need us, look for us around Funderland."
Ingrid roused herself. Did she want to contemplate the possibility that the two young Lost had been replaced by Fetches? Not really; not now; not with a fatigue clouded brain.
Ingrid's only thought is that the children should go 'home' because anything else is going to throw up other issues that she doesn't want to deal with right now. As for where Billy and Katie sit in the future, I'd suggest they be NPC / Shards who are considered part of the Freehold but don't contribute anything unless a plot demands it.