The sad truth is that addicts put their addiction first. That includes over dying people, their own kids, everything. You can't make him see anything when he is in his addiction. Unfortunately he will have to live with himself and deal with that when he gets sober.Stop lying now.Just stop. Come up with something that you can say "Tim is having a very hard time right now", "Tim isn't well", " something that is true that you can say. Your son is sick. It is sad, but not shameful.