That comes with having an alcoholic in the immediate family.
Why can't they just admit the issue they have ? Why do they have to have ago at everyone in their life ? Cause constant drama and fall outs with people, attacking people on nights out, causing trouble and getting themselves involved in stuff that has absolutely nothing to do with them ?
I've been dragged down today, hence the rant. I won't go onto details but your sibling should support and praise you, not try to drag you down into their hole