Angels with Us! - Guardian Angel?

Kara North found this photograph to be quite unexplainable. Notice how everything is in focus except the white blur behind them. Angel?

"This photo was taken at my Dad's house. There were three photos taken all in a row with this being the only photo with a strange light in the background. We did not have the flash on and from the angle you can tell it is a light from behind my head. I believe it is a photo of either my, or my son Noah's, guardian angel."