I'm in a rush this morning so a quick ten minutes in photoshop to get started. Here are three jpegs from the original file. I layered the two shots over one another and its obvious the camera position changes slightly, probably in all 3 axis, as well as the family moving slightly. So there is no exact pixel by pixel line up, and I haven't rotated or transformed in any other way to make it do so, as that can introduce artefacts in the jpeg.
I don't know what I think at the moment. I retouch photos as part of my job at a print/photo studio and it's a bit time consuming to find good evidence a image has been manipulated (and you really need the original files). And I've seen plenty of flares, but not one like this, and objects caught in motion (birds, insects, kids, pets...) and this looks different (but that doesn't mean its not a silver frisbee going left to right!). The depth of field is slightly different in both shots.
From my point of view the oddest aspects are:
1. The area of blurred pixels in the top picture that the 'obvious' anomaly neatly fits into in the bottom shot.
2. The figure, which hopefully is a bit more obvious in my 3rd version. I don't know if this is 'real', or just an illusion in the light and shade of the foliage. But last night I wrote it was leaning - it isn't, in the top shot it is distorted by the blurred pixels.
3. The erratic blurring along the left edges of the anomaly. I'll look at those again later.
Heres the shots with notes on what I did in photoshop:
Image 1 - photos separated into layers, overlaid and roughly lined up, cropped and vertically tiled.
Image 2 - Blown up - in Photoshop used Image Size to increase pixel dimensions by 100%, resampled using Bicubic smoother.
Image 3 - above image, with a translucent mask applied to most of image, to highlite the anomalies (done using a curves adjustment layer).