Joel, one of the most touching stories I've read on Medium - saying so little and yet saying it all.
The admiration and love you have for him, the pain of watching him decline, and the deep appreciation of all you both did just emanate from the page and into your reader's heart - You remind me, it can all go by so quickly - so
Live fully
Savor it all
...as you both did.
You are a magnificent baby and now big brother.
May we all be and have a sibling even half as special as you are.
Wishing your time together be a special time.
So much love to you.
Thanks for sharing with us.