Grandfathers Ghost?

This is a picture of my two sons taken last summer (yes they have diapers on their heads). Notice the white mist that seems to be moving through the picture?.

My husbands grandfather used to live in the apartment we live in now. Three days after he died my husbands uncle and aunt were sleeping in his apartment. His aunt woke up early in the morning and watched in horror as my husband's dead grandfather walked across the room and looked out the window (something he did often) and then disappeared. She, of course, was extremely shaken up. I'd like to believe the picture captured my son's great grandfather enjoying their company.