Here is the alleged "original" photo with areas highlighted that show clear evidence of Photoshopping. Remember this infamous picture showing alleged multiple Iranian missiles?
This was quickly debunked because of the obvious Photoshopping that is called out in this version. The same problem exists with the grandparents-minus-obama photo.
Note also the discontinuities in the bench and the top of the wall. Note the way the bench narrows as you move towards the center.
Now here's the kicker. If you take the "original" version of photo that I highlighted above, the one paulycy posted, and look at it using a hexdump program, as if by magic, the name Simon Maloy shows up, hidden within the image file. If you Google that name, the first link that pops up links him to Media Matters for America.
Another link identifies him as a "professional Rush Limbaugh watcher".
If you don't believe me, go here and download one of the hexdump utilities (I use hexdump32), and look at the file yourself.
This is a trap, people, and people like Maloy are laughing their asses off at you.