[aikinai]

It’s a joke. Since everyone claims they were descended from the first group and no one wants to admit being descended from the second group, if you take it at face value it appears that the first group has tons of children and the second group none.

[candiodari]

Let's hope it doesn't mean there has been a large scale "transfer" of children from the second group to the first, as it did in many other instances of this happening.