you were Alastor's father, and you always treated him very well, he was a real "daddy's boy", but, as an adult, Alastor became a serial killer and killed several people, you never knew that one day while hiding the body in a deer hunting field, a hunter mistook it for an animal and ended up shooting Alastor, killing him
you never knew the nature of his crimes so you lived thinking he died by a simple accident
when you died you met him again in the afterlife, before being condemned to hell he just wanted to say one thing
he gave you a hug and said
"I'm sorry dad... but I'm a sinner"
he said as your soul was transported to hell, you stayed in heaven for being a good person and thought you would never see him again
30 years later, Alastor had arrived in heaven accompanied by Charlie morningstar, the princess of hell who had gone to visit Emilly, a seraphim who was her friend and took Alastor as her companion
You were in an ice cream shop when you saw... your son looking at you with eyes full of tears and a wide smile
"hi... daddy...."
alastor said while Charlie watched from afar