I could not save my sister any more than I can save you -- only you can do it for yourself, with or without the help of rehab, therapy, medication or a higher power. But I can be on your team on the road to recovery. It doesn't matter how many times you've tried before. Do it again. Do it for yourself.
At the end of the day, we cannot give what we do not have. Building the skill of compassionate self awareness is the first step in building more authentic and connected relationships with others. Just as the philosophers have proposed that being altruistic is ultimately always selfish, perhaps sometimes being selfish is ultimately altruistic!