Try evicting the entire household from Edit Town, copy the household lot down to the bin, bulldoze the original, replace it with a copy, and move everyone back in again. That kind of reset might shake something loose.
As far as NRaas vs. "standard" mods goes, not quite sure what that means. A script mod is a script mod. But MasterController would get you where you want to go without doing anything to your game other than adding menus of commands on your sims, lots, and City Hall then sitting back and waiting for you to use one. It's removable if you don't like it.
Edit: Oh, if you are just building the household in CAH maybe my initial suggestion doesn't make sense. Perhaps add the 8th one to their own household then see if you can Merge them?