(as it is written in the law of the Lord, "Every male who opens the womb shall be called holy to the Lord"),
That was for the poor people, and so it would indicate that Mary and Joseph were poor. Which to me is interesting, because Jesus perhaps grew up in a home filled with poverty. And he knows what it was to have those kind of struggles that we have, as we think about the payment of the bills, and where we're going to get this and that and the other, and thus, He can identify with us in our concerns for our needs.