It has not been explained, yet.
I have just played through it again, making notes (I'm that sad - sorry). My (current) theory is that his family were actually protecting him in some way.
Trying to avoid spoilers (dunno where you are in the story) - somebody does something and then somebody else tells you something that should let you know that your family are far from normal. (vague enough?
). Once you learn those things go back and review the home invasion scene. When your father said "spare my wife and daughter" was it a lack of caring or was he shielding you? When he shouted "run" was he talking to your mother and sister, or did he know you were there and was referring to you?A page or two ago someone suggested that your sister betrayed the family and was trying to get you killed. I think the opposite is true and that she has been watching over you all this time, she always seems to know exactly where you are - she was in the park on your first day out of hospital, in your apartment block the day Lily left, in Maddison's gym, and a couple of other places (won't say as I don't know how far along you are) if she wanted you dead you would already be pushing up daisies.
Of course, i could easily be wide of the mark and the next update will prove me wrong, but half the fun of these games lies in the speculating.
