[Alouette]

"Who's In a Family?" by Robert Skutch, which depicts different kinds of families

But no families consisting of female human mother and male human father with their own children.

[shhrubbery!]

But no families consisting of female human mother and male human father with their own children.

LOL. Good observation.

The only heterosexual couple are shown not with a child, but with a dog and cat!

I originally thought the middle couple on the right side, shown with a baby, were supposed to be a female human mother and male human father. But now I think they're depicted deliberately as androgynous.