Your son will need to sue the neighbor in small claims court to compel the courts to have him move the fence or give your son the money so he can move the fence. He needs to file a copy of the survey (Showing the fence over his line), pictures of the fence, and three estimates to have the fence moved. His monetary damages for the suit are the average cost to move the fence plus court costs. Your neighbor has given your son no other choice and he should follow through with this so he does not have any problems should he want to sell the house, or should someone else move in where the neighbor is. Now that he knows the fence is in the wrong place it is his responsibility to take action to have it legally moved (which is suing the neighbor).
Good luck. If you have any other related questions please let me know. If you found this answer helpful please accept so I can continue to help others like you in the future. Thank you.
