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Hello, I am happy to assist you today.
If the mother has legal custody under a court order, then you would have to comply with that, regardless of what your son wants.
However, that doesn't mean that you can't discuss this with the mother and see if she will agree for him to stay a bit longer. Maybe that will be enough time for him to be ready to go back. You can always make an arrangement with her, as long as you do so in writing. But if she doesn't agree, that is when you run into trouble if you don't comply with the court order.
Please let me know if you have any questions about this.