*eradicted = excluded every shared trait (I'm sorry for the weird wording, I can't words no more)

I technically can start a new game. Just not with the one household (newly designed household, with newly created sims, dully noted) that I want.

I understand your excitement at having reached the following conclusion, but if this conversation is to continue it must do so without the profanities please.

Remainder of your post:
For some reason. One or another. One which I don't understand. I can't access the family with toddlers in it, if the toddlers were created using cheating and shift+click CAS during a game? Is this a thing? My least problem but at least it seems to be working now, at east. I hope the same error won't occur somewhere later in the game, where the family becomes unplayable. The previous crashes usually did occur after babies growing up. So I don't know whether the problem is completely fixed yet, but for now it's working?

I guess I'm not following how you are cheating to create toddlers. Are you creating children or teens and then aging them down somehow? Yeah, that's not always a good thing to do. But if it's not that, would have to go with some form custom content (hair? accessory?) that is or was toddler-specific and getting in the way unless you had tested all of your CC out by now.