Welcome to the SR family!
I'm sorry your mom's alcoholism brought you here, but you have found a wonderful resource for support and information. Taking care of your own boys as well as your younger siblings is a lot of responsibility for a young lady. Are there grandparents or a father that can help out with your brother and sister when mom goes off?
Please keep reading and posting as much as needed. Here is a link to one of our permanent (sticky) posts that contains steps we have taken when dealing with a loved ones alcoholism:
http://www.soberrecovery.com/forums/...l-problem.html