Kids disappeared after parents died

UPDATE: 

Just after posting this I thought "there must be a way to go back to a saved game after overwriting the last save". And there is! It's quite simple actually:

1. Go to: C:\Users\<Username>\Documents\Electronic Arts\The Sims 4\saves
2. Sort files by date modified
3. The game actually automatically creates backups of your saves when you delete or overwrite a save. "Slot_00000001.save" is autosave. Your "Saved as.." games should look something like this:Slot_00000017.save (Main save)Slot_00000017.save.ver0 (backup 1)Slot_00000017.save.ver1 (backup 2)Slot_00000017.save.ver2 (backup 3)..and so on
4. Now, what you want to do is move your .save file to another location (or delete it, althought I recommend saving it elsewhere in case something goes wrong)
5. Once you moved your main save elsewhere, all you have to do is remove the ".ver#"  from the end of the file you want to restore.

Now the file you renamed will be added back to the list of games you can load!

I hope this helps someone that had similar problems as me. Happy Simming!