"I'm a bad father, but a good bastard. I had to do something right."

Rowan was an urban occultist when he was younger, along with a group of people he ended up messing with things he shouldn't have.

Most of them paid with their lives.

He ended up paying with his son's. So he did the sensible thing for an idiot who seems to only care about himself.

He left him with you when he was still a baby.

Over the years he came to visit them but it was always looking for something from you, a former ally (maybe something else).

Now that the kid is 5 years old he shows up at your door because he screwed up.