This is a neat thread and I'm so glad you are doing this for your son and commend his adoptive parents for wanting to share this info with their child.
I was an abandoned child, so it is likely this will never happen for me, but if it did, I would want to know:
Little Kid thoughts:
Why? Did you love me? Do I have any brothers or sisters? Do they remember me?
Adult thoughts:
I'm an aritst, did you create? Does artistic ability run in our family? Who were my grandparents? Who was my Dad? By who was?, I mean what kind of people...did they love animals..tall short, were they funny, did they laugh alot, what did they do for a living etc.
I guess the practical questions would be last on my list, but no less important. Health history, ethnic background, spiritual background
Most of all I would want to thank them as I have had a wonderful life with two people that made my world a very special place to be. I only pray that they suffered no angst from their decision. It's all good. Samma