I don't know about you, but when I was a kid, all of my classmates, friends, cousins, etc. came from households that had a mom and dad who were married to each other.
There was the occasional divorce situation, and the even rarer widow/widower situation, but everybody else was a member of a family with a mom and dad who were married to each other.
Thought I'd mention that in case you wanted to know what "family" means.