Once you've seen the long-haired, bearded man facing left instead of the child on the man's lap, it's difficult to see the photo any other way. When this was first published some people said it was a ghost "haunting" the family. Some even said it was Jesus.
Look at it long enough, after you see the ghost, and you'll also notice that in his hair are two more faces. A woman wearing a hat with another woman looking over her shoulder towards the camera.