When I was looking for a home in my city, I saw many houses with subdivided homes, and some with many, many bedrooms.

My real estate agent would invariably say things like, this was once owned by the SMITH family, they raised 9 children here, and the brother/aunt lived in the carriage house out back.

You had properties with 10 people living in them.

Nowadays, people have fewer kids, and the kids move out and into new cities where they buy new homes. I bet the per capita in each home has dropped by half (at least) over the years.