>This family you know had 33% fewer biological children than they could have had. That's not necessarily true. It's possible - likely, even - that they adopte

>This family you know had 33% fewer biological children than they could have had. That's not necessarily true. It's possible - likely, even - that they adopted their last two because there would be issues conceiving a fifth. (Having a C-section limits the number of children a woman can have, for example - as does simply being above a certain age)