Strictly speaking, Original Sin, being first of all the
guilt of Adam's first sin, plus "the want {lack, absence} of original righteousness, and the corruption of his whole nature" (WSC 18), is
imputed to all his ordinarily generated offspring. So, legally it was God's WILL to pass by such imputation to Christ, seeing as Jesus was not born by ordinary generation.
The corruption of Adam's whole nature includes, then, his passing along to his offspring a corrupted constitution in every area, both moral, intellectual, and physical. Like begets like. And in the absence of any positive righteousness to pass on, there is no inherent possiblity of fixing that which is ruined.
There is a creation/traducian element here, but as I understand the problem, the issue is primarily one for the traducian, which sees transmission of "soul" as a product of human generation. One usual traducian response seeks to overcome the difficulty by positing the Male seed as the instrument of transmission, and since Jesus did not have a human father, he bypasses the naturally passed-along taint.
I don't know if that suggestion (that the Male is basically exclusively responsible for passing along an "evil" nature) is really the best way of thinking about the problem. Do we really want to say the woman's contribution to our constitution is "neutral", and our fathers make us evil? To me, that is much too facile an explanation.
So, how does Jesus escape a sin-taint from Mary? Jesus gets a
physical body from Mary. And it is a body just like ours. It is succeptible to natural weakness, and failure. It dies. In other words, Jesus assumed a fallen, human BODY. This does not make
Jesus fallen, however. But his human soul, whatever its origin, not having the guilt of Adam's first sin
imputed {legally charged} against it, possessed instead Original Righteousness.
Jesus did not come into the world to have physical children, so it is pointless to wonder if his physical children would have been physically corrupt. He didn't come to do that, so he didn't have any (no matter what Mr. Brown says). But his spiritual children are innumerable. Their souls are regenerated, which proves God can change a soul from evil to good by a simple work. And if he can do that, then he can also
prevent a soul (if Jesus human soul came purely from his human mother, and was not immediately created by God) from an initial state of corruption even when it is formed by fallen human agency, so that it begins instantly in a condition fit for Original Righteousness.
