if your brother was about to fall off a bridge would you try to save him? or would you let him fall? when some one starts taking drugs they are normally going with the croud, trying to escape, or have been presured into it. but as a sibling you can normally see signs of this happening. so if you can see what im trying to point out here; you have a period of time where its possible to save someone from getting to far gone. thats when they will recognise there mistake