It has been my observation that often times resemblance skips a generation or two. I have two great nephews (the children of two nieces from two of my sisters.) that look identical. I actual mistook the picture of one of them for the other.
Barack looks a great deal like his Grandfather, Stanley Dunham. Even his own Uncle Ralph Dunham and Aunt Virginia Goeldner say so. As for resemblance on his father's side? He certainly looks more like Davis than he does like Barack Obama, but genetics can play tricks like that. The only sure way to know is a DNA test.
Yep. It'll never happen, though. No way will he ever allow it.
That's happened a lot in my family.
When my daughter was about two, my dad came to visit, and showed a professionally done portrait photo to my wife and I. We looked at it, and wondered where and when he could have possibly had our daughter's picture taken.
It took us several seconds to realize that he was showing us a photo of my aunt (his little sister) from sixty years ago. I was stunned at the resemblance. My daughter was a dead ringer for her.