This was heartbreaking; I'm crying right now. You have a beautiful gift at painting these pictures with words. I really wish there was something I, or anyone, could do to ease your pain. I think it's wonderful that you take the time to notice the good things in life, and not just dwell. So many people I know do just that.
I really am not sure what else I can say; other than, this is beautiful, I'm sure just as beautiful as your little brother.