For the sake of discussion I accept that, at some point, demons involved themselves in this young man's life.
In setting out his story you've identified multiple points where things went wrong starting with his father's desertion. You've nominated a point just after the dream as the point where demonic interference starts.
There are a couple of obvious questions I have to ask:
On what basis did you determine that demonic interference started after the dream?
Why could it not have started at an earlier or later stage?
Based on what you've told me, the point where demons come into play appears arbitrary. I can't see anything in the story which explains how you determined that that particular point is the one where demonic activity begins. The idea of sowing discord could be equally applied at other points in the story. This goes to the issue of my third question:
How do Christians differentiate between things caused by demons and naturally (including human) caused events?
I appreciate that the point of the story is to help explain demonic
modus operandi but it also raises the issue of discriminating between demonic interference and non-demonic normality.
OB