> The incentive for pet Alyssa to be quiet is that she'll be disposed of if discovered, and she doesn't want to.

While I shan't (and can't) stop you from writing whatever you wish, this isn't that sort of world. Death isn't cheap here. I mean, apart from the literal sense in which recovering from death is a cheap experience that's mostly an annoyance to the parents...

Ahem. These are normal people, with a normal dislike of death and suffering, who happen to live in a world where neither of those two would happen merely from, say, cutting someone's head off. Physical suffering is approximately nonexistent, as there is an explicit line about the worst possible pain being approximately 'papercut', though that's still not something you'd randomly do to a friend.

Other kinds of suffering haven't changed. So while you had a good idea in making sure there's at least *one* seemingly-normal Alyssa around, there's no way any of them would want to hold her captive against her will, and that situation isn't something she'd grow to enjoy, either.

Killing her is just straight out. I don't think they've ever done *that* deliberately, and the parents certainly wouldn't.