Son's Ghost Photo

Catherine Arellano tragically lost her son, but knows he is still with them. She believes this photo has her son in the background behind the girl:

"Look behind the girls is clearly a face in the background. The boy in the background is a picture of my son about two months AFTER he died in a car accident at the young age of 17. This photo was taken with a camera phone, and as far as I know double-exposure is not possible with a camera phone. I am convinced that it is my son. I am also sending a photo of him while he was alive and you can judge for yourself."

Compare both photos. Is her son behind the girl above?