I DL the photo you uploaded here and played with it a bit... yeah, it's frustrating and really difficult to fix. I think you could probably labor through it with a clone tool but I say get some bokeh effect overlays and add some pretty round sun rays over that upper left corner. Pretend like it's a happy accident.
Gorgeous photo of everyone! I agree with everyone else... quite an achievement to have everyone looking at the camera smiling with their eyes open!
