Can’t answer your question about son w/o cah getting late onset CAH, but I do know the statistics for him being a carrier.  Each child you and your husband have has a 25% chance of having CAH, a 50% chance of being a carrier, and a 25% chance of being CAH gene free.  This is because you have a recessive gene and a "normal" gene and your husband has the same.  Your son with cah got a recessive gene from you and one from your husband.  Your other son could have a combination of recessive gene and a "normal" gene (one from you, one from your husband) making him a carrier or two normal genes making him CAH free.  The recessive genes you and your husband  have are not nessessarily mutant as much as they just got passed from generation to generation in both your families without being paired with another recessive gene.  From what my daughter’s endos have told us, a high instance of male infant deathes (usually atributed to something like SIDS) in the history of a family can be a sign that it was passed through the family but not detected.  Your son w/o CAH and any children your siblings have should be tested to detect carriers for the benefit of thier children.  Hope this helps.