Being the parent of a young boy I have come to learn a lot about superheroes. What has surprised me is the number of superheroes that were adopted or did not live with their bio. Off the top of my head I knew of Batman, Superman, Spiderman and The Teenage Mutant Ninja Turtles; but there is a surprisingly long list.
With junior's love of superheroes we talk with him about the fact that many of his heroes are just like him. They have faced great adversity in their past and were not raised by their birth parents, but they have become amazing and strong. Junior has in his room a sign reminding him that Superman was adopted too and we frequently remind him that "he is just like Superman."
Each superhero has a different story some were sent to live on another planet to keep them safe (Superman), some lived with an aunt and uncle (Spiderman), some had parents who died (Batman). The same is true for adoptees. Each of their stories is different and unique. It doesn't matter the circumstances that have resulted in them not living with their birth family, they are not alone.
I don't know why there is this pattern, but I am glad there are positive role models that can show junior that he is not alone. There are others out there like him that feel the same pain he does and can inspire him to be something great. With some people thinking that children that have been in foster care are troublemakers or will become juvenile delinquents it is great to be able to plant a seed that maybe you can be the next Superman.