See below...
The Church does not laicize priests just because they want to be laicized. The laicization of a priest is very, very serious and happens only because that priest has either commited a serious crime, or because he can essentially prove to Rome that he should never have been ordained in the first place because, for example, he has a very strong drinking or drug habit that he had managed to hide from his superiors during seminary and which he has no intention of giving up. Or because he was, for some reason, in some way, coerced into becoming a priest to begin with, or something that indicates to the Church that his ordination was a genuine mistake. The priest who wants to be laicized simply because he does not want to be a priest any more will not be granted his request. Laicization doesn't work that way.
Thus, Shannon's brother remains a priest and is, therefore, inelligible for the Sacrament of Marriage and will, therefore, be living in serious sin until such time as he decides to part with this woman to whom he wishes to be married.
Does this maybe help explain to some on the thread why Shannon is so upset (and why the rest of us should be concerned and praying)?
Greg