>>8162709
This book was written by a dead man who communicated with a living person through automatic writing.
The dead person, by grace of God, earned the right to visit the living and took control of the living person's hand, which he relaxed, and began writing.
http://www.spiritist.com/arquivo/books/eng/AstralCity.pdf
tl;dr if your father truly followed the Laws of Love, laws of our Creator, and filled his life with Love then it's a matter of removing the trauma of death. He is still alive and will continue his life in one of many worlds of spirit, preparing for the next incarnation. You will see him again, possibly even without leaving this physical body.