Loss of mom and dad

[Taz_Zoee]

That must be so difficult. I can't imagine losing one parent, much less both so close together.
I agree, do what you normally would for his birthday. Don't assume you shouldn't just because of this. Especially since he is a private guy like you stated. If you didn't do the norm it might draw more attention to the other issue and he doesn't need that either.
And I also agree with what others said, just be there for him. However that may be.

[Karen]

Simply telling him you are sorry for his loss, and if he needs to talk, ever, you'd be there for him. I would not make a HUGE fuss over his birthday next week, but a cake and card would be nice. He may not feel like celebrating, but a quiet reminder that there are people who care about him would be appreciated, I bet.