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dpesce: My thoughts as well. I'd take your brother along with you for the car shopping experience and quality time together. It'll be a win / win scenario where you get to land him on a car (out of several to choose from) that is hand picked and is exactly what he wants and is fully happy with.
OP: You know best, the BRZ is a niche car and may not be the right cup of tea for some folks. If and when he picks and drives the precise BRZ and is 100% sold on owning the car for himself and for the long run, that's when I'd pull the trigger (if I were in your shoes). A car is a big gift, as you mentioned.
He'll be surprised and happy either way... So cheers to you and your family for making the effort to show your appreciation.
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DeeezNuuuts83: You sure you don't want to squeeze in a BRZ for yourself while you're at it?