shelbeehive There is one other thing you can try. Try saving the household to your library. Delete the originals in the game and then move in their copies from your library. They'll lose all their relationships outside of the household and their jobs. If they have anything in their inventories or the household inventory, lay those out on the lot somewhere before deleting them. One way to get the room for that is to add a big basement room if you don't have the space already. After their copies are moved in, just pick up the items and put them back where they were. Also, empty any containers like storage boxes, fridge, or jewelry and flower workstations and put them on the floor. Tbh, if you have a lot of anything it might not be worth the trouble doing that because you'll have to pick them up one at the time. Once the copied sims are on the lot, you can just pick up the collectables from shelves, floor and walls and drop them in a sim's inventory to get them to register for the collections again. And you might want to make a copy of the save first or at least not save until after you are sure it works so you can reload the save if you need to. If that doesn't work, you could also try moving one of the sims out and saving them separately, then put them back in the same household and cheat the friendship and romance levels back. Since they won't know each other, you'll have to introduce them, etc. You should get the first kiss option back and that might give you woohoo and TFB options after doing the first kiss again.
Hope this helps.