I wouldn’t throw money at this unless it’s really a matter of a health issue. I mean, the guy is essentially a random sperm donor.
As many other posters have responded you need to gather more information before he can be found. The first question that needs to be answered is if his mom really does have more information. Does she seem like she’s trying to be helpful, or no?
I would run through this list with her:
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Does she remember where he worked? Or what he did for work?
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Does she know the names of any relatives?
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Did he serve in the military?
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Was he ever incarcerated?
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Where was he originally from?
*If *you truly think she has more info, but isn’t giving up the goods, you may want to consider telling her that you’ve found his father and that you are going to meet him next weekend. It might force her into telling you why she didn’t want her son to meet him or you may find out that she really doesn’t have anything more to go on. It’s a little sneaky, but it will get you the answer to the question.
The second route I would try is DNA testing, it’s a long shot, but if it works it would have a lot of hours of work in trying to track him down.
If you still have nothing… consider visiting the AA meetings in the area (I have no idea if you live close to there or not) and getting to know some of the old timers there. Guaranteed some of them have been there 25+ years, it’s possible they *might *remember him if you had something distinct you can mention.
I would recommend against this. Many of the attendees don’t appreciate “tourists”. Maybe you can post some fliers at meeting locations with your contact info, and let them make contact with you if they are willing.