You did not inform the Service so the visa that is available for him is in that category. The problem is that when he got married she dropped out of the FB2B category. Now that you are a citizen he qualifies for FB3 category but I am not sure he will be able to retain the old priority day.
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After marriage, your son's category has changed. Unless he gets divorced, he will have to wait for the priority date to become current. According to the latest Visa Bulletin priority date for married sons in F3 category is 22JUL02.
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Certain petitions will automatically convert but retain their original priority dates. The answer is found in 8 CFR 204.2(i). For explanation of this issue you can consult The Sourcebook by Kurzban page 1006 (13th ed). I would of course not try to handle this yourself but add his wife and son by consulting with an excellent immigration attorney to help you ASAP.
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