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yes. if there is a court order currently in place giving custody to the Mom, then the Dad needs to file for a Modification. he can get the documents from the clerk of the court, if he feels he would like to try it without an attorney
he also can request that court hear from the son in chambers as to his desires. the court will take what the son wants into consideration when making a decision
the Dad needs to be prepared to show that he can provide a good and solid home environment for his son.