Did your son ever say that he saw your father at the cemetery? Not trying to change what you believe, but our minds, particularly our subconscious minds, are able to process much more information than our conscious minds. The outcome can be pretty eerie, but it’s not magic or spirits. This in no way diminishes these experiences, of which I have had many. Several affected the direction of my life, and I appreciate them greatly. I don’t claim to fully understand how they happen, and I believe that the natural world is so fantastic that it’s not necessary to have a supernatural world.