NPC Roles in Cottage Living, Cheats don't work

If you can't restore things back the way they were, I would advise you to save your family to your Library via the Gallery, then start a brand-new save. This will restore what you changed, and then bring your family back by downloading them. If you built a lot for them, make certain you have a copy of it in your Library, too and download it to your new game, then add your family to it. Best of luck!