I have a son whose a jr.with bad credit who use my address,and for some reason the credit agency can tell the between us.How can resolve this problem?

You must contact the credit reporting agency in writing (I recommend doing so by certified mail, return receipt requested), demanding that they correct your record and providing them with the correct facts setting forth that the delinquent accounts are not yours. You should provide the appropriate documentation leaving no doubt that the delinquent accounts belong to another person.