Sims 4 - Save file has grey llama icon on households

@Swishaa_Bluntss  Does the same thing happen in a new save in a clean folder?  If not, then you can try recovering one of the game's automatic backups of your existing save.  Hopefully at least one of them doesn't have this issue.

https://sims4.crinrict.com/eng/2014/09/save-games/#wiederherstellen

It's best to use the manual method of recovering the backup, so you can make a spare copy before loading it.