Registering bonus code on xbox website, not working...

That isn't how it works unfortunatley. You got into the Alpha from registering for the Beta (they selected a certain amount of users from the Beta for the Alpha), you weren't entitled to the Alpha, that was a bonus, you were only ever entitled to the Beta
code

It is basically Assassin's Creed Tweetdeck, which works great on tablets and smartphones, nice bonus in game content as well for registering for it

"Do bungie e mail the 3 codes once you register the original code on their website?" Yes. They should appear on your Bungie.net account also.

I updated my subscription to gold and the code now works.

Do bungie e mail the 3 codes once you register the original code on their website?

You're a good father.

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http://www.rankupxp.com/ Sign up and register with ANY email. It doesn't have to be the one your son uses to sign into xbox. Once you register, you'll be able to enter the codes. Before you redeem your
codes make sure you hit redeem multiple codes so you get a bonus for redeeming multiple codes at once. Oh and you may want to hurry up too because the double xp promotion ends in 10 days!