Mental Health/Drug and Alcohol/Family Issues

My last post about my friends was a nice departure for me. It's refreshing to show a little more human side every now and then. Now it's time to talk about something a lot darker and more serious.....family issues.

My older brother got married on Saturday. Everything seemed to be going well until the end and the pink elephant reared it's ugly head. Our family has a very checkered past when it comes to drug/alcohol/mental health and depression problems. Some in check and some skyrocketing into space.
I'm not going to name names because everyone knows someone or of someone whose life is or was a freakin' mess.

I won't go into details but it's gotten to the point where it's time for an intervention or I fear a very close member of the family is going to die or commit suicide. So what am I doing sitting here typing a blog and not doing something to help this family member? I don't know what to do at 2:00 in the morning. It's a unique situation. She is married and has an adult kid at home.
For years all of us siblings have been trying to help over the phone. Believe it or not that is harder than it sounds. It's a bitch when the person who is suffering will not listen....They refuse to hear it....When you want to tell them to get help and it gets quiet for a minute and they go right back into the vortex that sucks them and you down into that ominous black hole.

I have found that there is a certain selfishness in depression and mental health problems. "Life has fucked me royally and the people around have done the same." It's hard to comment on that remark when one of those people is supposedly you, I guess. It's dad's fault, it's the schools fault, it's the bosses fault, it's the damn mailman's fault, it's the world's fault. It's bad luck, it's the curse, this shit always happens to us.

It's selfish to not come to family functions, it's selfish to not answer your phone or the door bell. It's selfish to take up people's time, it's selfish to try to drag people down with you. Everyone has a life and family of their own.
It's selfish to talk about the same problems for ten or fifteen years and not do one single thing to move ahead or get help or fix it or put it behind you. It's also very selfish to blame every person in the family for your problems and your messed up state of mind and affairs. It's selfish to try and ruin your brothers wedding day because you are fucked up out of your mind.

But........you are my sister and I love you!!!!!

So now it's the day after the nightmare mess, what do I do now?
Do I sit back and wait for death to sneak up and put an end to my sister's suffering. Any attempt to intervene will be a battle with the brother-and-law.

Do I become selfish and worry about myself and my family? The stand-by, "if you ignore it , the problem will go away", is not working. It usually never does. Like I said before we have dealt with alcohol abuse in the past but this dropping out of society and hopelessness has gotten out of hand.

I'm open to suggestions...