A strange kid in a devils suit

I am not so much a participant in this dream as I am an observer. I can interact with the people in the dream but I spend most of my time looking down on things. My father is taking care of some strange man who is dying. The dying man is over a hundred years old and for some reason I think he is my paternal grandfather. However, Pa died in 1972. There is this feeling that he really did not die but had been alive all this time. I was afraid to visit the dying man. My aunt told me that he was 120 years old and that he was nothing more than a skeleton. I find myself witnessing little scenes from my fathers past that reveal more about this strange dying man. As it turns out, the dying man is my father's real father. My grandmother and aunt turn out to be nuns that worked at the orphanage where my father lived as a child. The last time my father had seen his real Dad was when he was dropped off at the orphanage. The was this image of the real Dad driving away in an old car with a kid that had on a devil's outfit. All of this new information about my family left me feeling strange and wondering if I was really the son of my father. The last thought I had was, "no wonder he liked my brother better...I am not his son."