For a long time I deceived myself thinking Zero had to be the son of Stanley Ann because of the supposed chin resemblance. I realized early on he couldn’t be the son of the Kenyan. Then the Auntie thread opened my eyes.
And the chin isn’t at all alike anyway. Totally different facial structure. Apart from having the usual number and general arrangement of features.
These two guys?
There's nothing compelling there that makes me say, "Wow, father and son! Or at least definitely related!"
Two thin black guys have their hair cut the same length. Maybe they cock their heads in the same way or wear similar glasses or point in the same direction. It doesn't mean they're related.
One thing you do see is that Obama copies some of Malcolm's mannerisms and his general style. Sure, he resembles Malcolm a little more than he does, say Martin Luther King or Jesse Jackson, or John Lewis, but that doesn't make them blood relatives.
Maybe these theories got started because Barack Sr and Barack II didn't look much alike. But look at Barack Sr's other sons, Obama's half-brothers. Some of them -- Mark, George -- don't bear much of a resemblance to Barack Sr either.
I don't know that they're actually father and son, but a superficial look would be more likely to see a closer resemblance between Barack Sr and just about any other Kenyan Luo than between Barack Sr and his presumed sons.