How Many Households?

I posted in here before as a person with 6-10 families per save. I would have added more families, but the Sims worlds have limiting housing, even with being able to add more houses. I also don't own every single expansion yet, but I have a good amount. Some families are as small as one Sim and a couple pets, while others are a full eight. There is a mixture of both, and to keep the population kind of controlled, I plan to marry some families to each other, and give the heirs the most kids, and let their other siblings have at least one kid.
That way I can add more families, without getting over populated, and keep my old families alive.
I keep aging off for the moment, but plan to turn in back on when I get my Sims where I want them, and will let them age and die.