I am sorry but there is no liability here for the person who received the number in error. First there is no way to prove that the person knew that he had the social security number of someone else and then as the years go by, unless you check your social security number regularaly (which most people do not) there is no way to even prove that this person even knew these credits were accumulating. Regarding any liability of the social security administration -- when a government employee makes a mistake that has to do with their job then there is no way that a person can sue for it. I wish I had better news for you on this, but about the only thing you can do is work with the social security administration to straighten this matter out.
Even under these circumstances it will not matter unless you can show that the other person used it for identity theft or to commit other crimes and this damaged your son in some manner (either it cost you money to straighten the matter out or your son's credit is ruined due to identity theft). Remember, if social security actually issued him the number then it was not his fault or issue -- it is just like a situation where someone commits a criminal act and someone witnesses it -- the witness has not legal obligation to come forward or to do anything about it. If this person was issued the number and used it legally to work, then he had no obligation to straighten it out. The only thing you can do is get social security to straighten the earnings records out here. HOwever, if there was identity theft you should call the police and get them involved and if this has actually harmed your son in some way then you can pursue a suit against the other party who did this and should not have.
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