The image is a compilation image, pieced together from different shots.
The photo with the leis has been presented before on FR and even people here who have extensively researched the tiniest details of Obama's life were not sure when it was taken. The implication of your post is that Obama has put out all these fake photos. I do not see any purpose in putting out a fake "mystery photo" with no story behind it.
As for your claim that the Kenyan family photo is a compilation, it is clear that is is just a regular photo and no one is claiming that Obama did not visit Kenya and meet with all these relatives, so there is no reason they could not have gathered for a family photo; indeed, they had every reason to do so.
None of these photos are faked and George H. W. Bush is not the son of Nikola Tesla's assistant either.
the gramps, toot, and barry in central park photo was from Obama For America via Time Magazine.
http://www.time.com/time/photogallery/0,29307,1834628_1754223,00.html