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Yes, if son is permanently living with you now, then it would be improper for the mother to continue to receive child support because those payments are to assist the custodial parent with their additional costs in having the child live with them.
So you would have grounds to file for a modification of the child support order to change you to the custodial parent and even potentially have your ex pay support to you, depending on the disparity in incomes.
But as for unilaterally stopping any payments, no, you would have to seek to have them stopped with an order from the court because until that occurs, there is still a standing order for you to pay support.