The second one, because:
1. If the feet of the subjects had not been removed in the first picture it would be an obvious fake - the two supports of the bench would be too close together.
2. If the first picture was the original, it would be extremely difficult to reconstruct the feet of the subjects in the second picture.
3. The photoshopped-in parts of Stanley's jacket and the grandmother's dress are lame.
4. We wouldn't even have a picture of the grandparents sitting on a bench in Central Park unless they had come there at the right time to visit their grandson.
LOL! I love the way you think...as for myself, as I wasn't there when the photograph was taken, I have no way of knowing it was taken in Central Park.