You mean aging it all the way up to teen via cheats? I don't know - I wish I knew what was actually screwing up here.
I can't think of much in regard to the existing fambly. Maybe severing family ties to the kidling?
I specifically wanted to keep the family ties, though. I suppose I could put it up for adoption via the teleporter before teleporting it to the labor camp, which might more effectively sever its ties to the lot (family ties don't get reassigned until after the child is readopted). I have successfully put kids up for adoption and had them adopted onto other lots with no problems, but those were complete adoptions, with the adopters becoming the kids' parents, which I don't want to happen in this case.
I guess I'll just move everyone out and back in again for now and try to do it that way next time.