Hi JHerup,
With the newest patch, some lots are now set to generic. Try evicting your family and reset the lot type to make it stop. Then move them back in.
It's been suggested to try having the Sims leave the lot and go back. The other Sims not living there should be gone.
It looks like this has been happening since December's patch.
Hope this helps, and Welcome to the forum!!
MrsFlynn