Hi there and thank you for your question,
I will try to assist you with your legal question but please feel free to ask as many follow up questions as you like until you are 100% satisfied.
First, your son can't give his consent to what you're suggesting. The high court will not accept it. As far as the court is concerned, your son is a minor and doesn't have the ability to decide anything for himself. He needs you to decide things for him.
Second, why doesn't your husband simply adopt your son? In that way your husband will become the "adoptive parent" of your child, and all of the "custody" things that you're talking about happens automatically.
Finally, we don't talk about "custody" anymore, we rather speak about "primary care giver". That is the new term and it is slightly different to "custody".
If my answer hasn't answered all of your questions, please send me a REPLY with follow up questions so that I can continue to assist you in this same thread for as long as you need. Let me know if you need more advice - dont just rate my answer as "bad".
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Good luck and best regards,