My older sister is an alcoholic and had had bought a of sobriety. She is currently drinking all the time, calling family members drunk at 8 AM in the morning. She is extremely mean when she's drunk and after countess attempts to make our relationship smooth we are not talking at all. She is a bridesmaid in our wedding and I think she is still going to be in it. She has her dress and everything. My concern is that our reception has an open bar and a pool in the middle of the reception floor that won't be covered or roped off. She got completely drunk at her own wedding, was in a sober phase for my other sisters wedding and she's now drinking again just in time for our wedding. She's my sister and I love her dearly but she is not herself when she drinks. So I am looking for any advice on how to handle things with her. I'm not really sure what to do.