The ghost of my grandfather

I had the strangest dream the other night that the ghost of my grandfather was lurking outside the window. It was strange because I have never met my grandfather before in my life but now I could see him so clearly. It was as if I had known him all my life. He had no hair, was around 80 years old and he was looking away, that is, it was his profile i could see. I knew he was dead and that this was his ghost come back and I was quite scared. He had come to visit the family and my whole  family were gathered in the front room. What does it all mean. And what was he trying to say?