there's a good fix to all of this that I think I already pointed out earlier but I don't think anyone saw it. let me sum it up.
1. Try updating your CCs/fixing errors from infant update via Sims 4 Studio
2. If the first step doesn't work, remove said household you're trying to load and re-add them back.
If none of these works, I would really recommend you make sure script mods is disabled in the settings to see if it works.
If you still want to try to load the game with CCs/Scripts then first you need to update them and then, going thru all your CCs, even if you have to unmerge them, and delete a couple of CCs you don't want, and on top of that move ALL your CCs to a new folder, then grab those CCs by fives and load up the game. repeat the process until you can see which one is the problem.
For me, this really worked because it gives me some time to actually identify if the problem is CC related or not. for me, it wasn't CC related when I kept adding back a whole bunch of CCs, it was household related. meaning, as a last resort I had to delete the households from the world, and go thru the library and re-add them back to their houses and it worked amazingly well. So you might have to either delete a few households or, delete a household from the map, and then re-add them back. hope this helps you all. :-)