Has your son had any counseling? In my experience counseling REALLY helps not only the children but also the parents. Play therapy is *wonderful* for children your son's age as a way of working through the issues that being molested cause. Something that I am almost positive that your local protective services office will NOT tell you though is that protective services is **Required by law** to PAY FOR counseling services for children who are abused for 5 years after the abuse, so it *shouldn't* even impact your budget.
Part of the reason that he talks about it is because he feels comfortable talking to the people that he talks to about it. Personally I would try distracting him OR simply sitting him down and explaining to him that he is entitled to his feelings about his "old dad" (which is what MY children also call their bio-father and he has been out of their lives for 5 years now) and that you think that it is wonderful that he feels so comfortable talking about it BUT him talking about it makes other people uncomfortable so it might be better if he picked just a couple of people that he (and you) really trust to talk to about it. That gives HIM an outlet for his feelings while giving *you* some relief from the fear that he is going to walk up to some stranger in the store and talk to them about it.
HUGE HUGS
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