Hello SisDsrvsBetter. Welcome to this great forum.
Has your sister told anything to you about this... ? unfortunately just as alcoholics, many partners are also in denial about the problem, or know something is wrong but they put up with it anyway. There is no way to know when it is enough for either one of the dancers, in this sad dance.
I also dislike hipocrisy and would feel totally upset in your shoes.
One book that is useful to us worried about someone else's alcoholism, is "Codependent no more" by Melody Beatty. Alanon groups also help many. Have you or your sister gone to an Alanon meeting before ?
There are others with ESH that will be coming along - you are among people who understand now, and many have already reached a peaceful state, regardless of what the alcoholic is doing... regardless of what others in general are doing.
There is much hope and healing going on in this forum everyday... you are no longer alone (((((((Hugs))))))))))