Welcome and I am glad you are here, though I am sorry for the reason you are.
I started with counseling about your age, and in the long-term it has helped immensely.
I just want to say that the behaviors that I read into your story at age nine sound like problem drinking to me then. That would have hurt me. If that was then I can't imagine how hard things have gotten in the last two years.
There is a saying that we call the Three Cs
You did not cause it
You cannot control it
You cannot cure it.
In addition to counseling, Al-anon (for friends and family who have loved ones with alcohol problems) has helped me a lot. They have books, meetings etc but all designed with people who have been impacted by alcohol problems in their life. You might want to look into them further.
Keep posting, that helps too, and many of us have been in similar situations.