Household Disappearing

I am playing on PC via Steam, and recently started experiencing one of my households disappearing. I played as the household and after I saved then exited, I came back to see a different household in the menu. I clicked resume and tried to switch to the other household through manage worlds, but their lot is just an empty house, everything is there but the family. During this they don't show up in my played households nor my other households and aren't in the relationship panels of the Sims in the household it switched to (they're family, legacy save). I went back to the menu and recovered a save that had the family.  I play as normal, save, exit - same thing happens again. Over the course of days now I've done eveything I can find on Google: verifying my files via Steam (a few times), clearing cache, trying to use "save as" instead of save, uninstalling & reinstalling the game - and sometimes I'd be safe and get to keep my progress, but eventually I'd end up with the same problem. I've exhausted all the information I can find and all the things I can think of and nothing fully fixes it. Any help would be greatly appreciated.