My mom would have been 14 back in 1940, so I think that her one sister was married, but her other sister was still home. I think her aunt and cousin also lived with them at that time, although he might have been married at that point, as he was a few years older than my mom.

Edit: I found my grandparents, my mom and aunt, and my great-aunt and my mom's cousin, who all lived in the same house. I emailed the link to my brother. My only problem was that I couldn't get it to print landscape so that my mom would be able to read it.