Depths of Denial

My husband's son is a chronic alcoholic and the entire family feels he is also bipolar or something similar.. He is spending at least 9 1/2 months in prison now. Following at least 2 other stints in jail and at least 2 stints in rehab facilities and halfway houses. He denies he has a mood/mental disorder, and won't listen to his father (who is 17-years sober and also medicated for bipolar), and sister (who is a DR). This recent jail sentence is from his 5th DUI - fortunately no injury accidents... how to convince him that his way is not working?