[Mr. K]

wtf? whose hand is on Obambi’s left shoulder?

it cannot possibly be grampas, because his arm is clearly going down to his side

[E. Pluribus Unum]

Photoshop. No doubt about it.

Looks to me like it was originally a photo of the grandparents, and Ubama was spliced into the middle of them.

Look at the rock wall behind their legs. Something isn't right there.

It's a fake, and a pretty poor one, just like the PDF of the "birth certificate."

[cameraeye]

There is definitely a person in the center, but can tell photoshopped by the lighting. Just don't match!

[C210N]

wtf? whose hand is on Obambi’s left shoulder?

If those are his grandparents, perhaps he is of relation to the Adam's family, and that's the four of them there on the park bench...