Perhaps you should concentrate on your wife. Point out local examples of baptised and unbaptised kids in your area that have left. Accentuate the difference in the family dynamics depending on the kids baptismal status. Bring up the very real possibilities of what could happen to her 14 year old. Ask her if she really wants to be forbidden all contact with her son for the rest of her life. I think most moms need to be warned...and reminded often. They really suffer when it happens. And it does. Often.
Wheels