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There really aren't any words to express how one feels at a time like this. It's perhaps a loss we all expect yet still struggle to deal with it. Know that you and your wife and in my prayers and that Joe is resting comfortably no longer struggling to take his next breath. You've traveled a tough honorable road through all this and I know in your heart you've done all you could to provide for Joe the best you could. It's heroic yet no parent would ever consider it as such. Take care my friend and rest some, you've earned it. Gods speed.