One specific household will not load.

@FairyB3lls

There can be two reasons.
The most common is outdated CC used in this household or on a sim member of this family.
Move the mods folder to the desktop.
Delete localthumbcache.package file in the game folder. Delete also all folders with the word "cache" in the name.
Fix the game in Origin.
Origin/Library -right-click on TS4 - option "Repair game"
You have to wait until Origin will fix all packs, not only the base game.
Turn on the game to create a new, empty mods folder. Check if a game is working now properly
If it is fixed, copy from desktop your mods and CC and paste it in the new mods folder. First, paste script mods every time checking if the game is working properly. Do the same with CC but if you have a lot of this, try the 50/50 method ( divide your CC into smaller batches for example 50 pieces in one subfolder and check these subfolders one by one.

Another reason may be that the calendar for this family has announced holidays such as a harvest festival. In this case, you must wait two days before you can enter this household.

I don't work for EA