Lucie,
Glad you found us, we all know how you're feeling.
We all wish there was just one small little itty bitty thing we could do to help our addicts into sobriety, but unfortunately, there isn't.
Try to find some meetings in your area, it's a good thing to have a support system, and those people at meetings, just like us, know exactly what you're going through.
AND be good to you.
All your parents, and siblings may have all their attention diverted onto the addict, thinking they can help, but remember how important YOU are, okay?
hugs to you, sweet girl,