The addict has to decide to take the risk that life will be either more livable or just plain better without the drugs and/or alcohol. Sometimes it may seem to take awhile to comprehend that it is not only much better but life (as opposed to the distorted reality of the drunk or drug addict.) I have been where your nephew was at more than once and God intervened both times to save my life. May your family find peace. It has to be so painful.
Thanks for the kind words.