Happens to me too, but I've never thought of it as a bug. Boring, yes, but probably easier for the game to generate single households than big households.
Yeah, same here. I mean, it would make sense for single-person hh to move in to create a story with someone else. Like: Just out of college and on my way to buy a house. Or: Sims to create stories with. You don't want to have a whole bunch of families move in around you while you are still single. It could also be the size of the house in the details panel from Build Mode. If you set it to something higher than 1br, there could be families moving in.
