Does anyone think or have experience with what to do about an addict in our family??

My older sister has been an addicted to pain pills and booze for as long as 30 years. It has been an off and on thing, so she might be sober for a few years, then she goes on a binge. Next thing you know, she has lost her relationship. Then she gets sober (with no apologies to anyone) with help from others. She's good until something happens. Over the years, the time between binges has grown to months. She can't breathe, but she smokes. She just got booted out of a homeless shelter due to another relapse. She has lost everything, and she acts as if it is ok. No "I'm sorry", just crocodile tears. It hurts my parents every time, but they have done everything for her, and she still turns to drugs. She knows where to find them day and night. Now with the holidays here, she is once again in dire straights. Talking does nothing. She needs AA like a hole in the head. All they ever did was convince her she could not quit drinking, always an alcoholic. So what would you do?