Positive thoughts sent your way... That is great that they started CPR so soon, irreversible brain damage occurs after 6-10 minutes. He was getting some oxygenated blood way sooner than that which could be the difference of a full recovery to permanent brain damage.
Very sad to hear this. I can't imagine how it feels to be in your position. Your brother must be beside himself. I'll be praying for Gabe, your brother, and the rest of your family.