accidentally deleted sims household from gallery

@oreosallday  I thought of something else that may be worth a try: open your game and look in Manage Households, the icon next to the Gallery one. Look through all the sims in both My Households, and Other Households, to see if they are still in the game. If they are you can load that household and save them to the library. This will work in all saves you have made, as well as if you have any old The Sims 4 folders with saves, saved somewhere.