I went through a couple of saves, but I don't remember which one it was that Minerva lived alone before she died. One game had been running a long time, but I couldn't find any homes standing empty. Surely one of them must have had the household die out? George Cahill's bunker had new residents, he's definitely gone by now. But maybe he married and moved out first, I don't know.
Well, I did actually have 2 homes standing empty. Both were ones I had lived in before. One I built from scratch, one I downloaded. Sure enough, both were designated as having 0 beds. I took the opportunity to fix that, and save my scratch built one to my library. One of the few builds I'm really proud of!
I had a good laugh when I came across my simself's household. I must have added him later on, because he should have died off by now. But the household-- full house, at least 4 different last names, I would love to know how it got to there! Plus, one of the sims there: I made a restaurant a while ago, and I wanted it to have all female staff. But I didn't actually want to run it. So when I visited for the first time, all the waiters were male. I used cas.fulleditmode and made them all female. One of the household members was one of them! She had been married and had kids before I did that to her, too.