Hi Jimmmm!
Wow, it has been a week. I'm sorry that you and your mom are going through this!
You might want to consider attending a Nar-Anon or Al-Anon meeting. These meetings are for friends and family members whose loved ones are addicts/alcoholics. If you prefer an "non-Higher Power" centered sort of meeting, there are plenty of other options available.
I hope that your brother and sister reach out for the help they need. You will all be in my prayers.
HG