I'm sorry, that boy looks more like Malik Obama.
I’m not even convinced that is Obama Jr. in that picture with Obama Sr. He had other children in Kenya.
One thing that is bothering me in that picture is there is more flash reflection off the child then the man. Like two different lightings were used. And both, the man and child, were in the same angle of the camera.
In my photo software, I can lighten up one person and leave the other. I can make it look like a flash affect too.