They also didn't contemplates it as something ubearable if they had to live many persons or even extended family in the same small house, including rentals, and if two persons had to work hard. Manual laborers, factory workers, etc, farmers where both father and mother worked, still had many children.

It's not like this only happened in the window between 1940s-1980s where the run-of-the-mill average job let you support your entire family and purchase a big enough house.