That depends on the situation. I find it easier to sit everyone down and talk the problems through, however in this case it may not be a wise idea. Arguments could start and then you could get the blame. If you feel your life or lives of others are in danger you could try contacting childline australia - (1-800-551-8000) although unlike the uk they can't screen your calls and you may be charged for it or social services - 1300 657 843 / (+61) 3 9614 8755. They can each offer payo and support. You could also try going to your doctor and asking for his advice, perhaps another adult you feel you can trust such as a teacher or maybe an aunt.