My son somehow purchased a game with out my permission

You would have to contact support and speak to billing. 1-800-4my-xbox if you're in the US/Canada or
support.xbox.com/contact-us

It turned out it was a setting in the permissions of my son on the x-box

Thanks for your reply, but this was resolved. Like I said my first purchase for my son from the Xbox as a gift didn't register. I then bought under my son's account with my permission. Both payments went through. I asked to refund the first purchase but the second was instead.

After contacting support I found that on the first purchase under accounts.microsoft.com on the purchases tab, Orcs Must Die 3 was given a redemption code that I was able to redeem on my son's account. So at this point the issue is resolved.

Hi. It has gone on my account and not my sons. Could not get it to go on my sons as it kept saying need parents permission. So confused!

Actually yes the 360 did have this capability. At one time you could transfer the rights and permissions to another user. I don't remember if it had to be some one in your family or just some other user on that counsel. I have used it multiple times to
transfer the rights and permissions when I first started playing on the system. It was the way to purchase the content through my account and transfer the rights and permissions to my son