If you are able to document and prove the information that you outlined in your question, you should have a good case for supervised physical custody. I would recommend that you meet with an attorney to discuss your options as you may need to file an Emergency Petition.
My response is based solely on the limited information contained in the question. It is not meant to substitute your attorney's advice.
Truly, it will come down to the facts of the case. A history of domestic violence, alcohol, and bad decisions (which the children have witnesses) may provide cause for the Court to grant supervised visitation for the time being, until Father can provide "trust" to you there remain no issues. This will be an important issue to bring to the conciliator, and if not, to a Judge. The best interest of the children is the main issue, so you will want to have an experienced family law attorney represent the facts and how they are not best for the children. Speak to an attorney to see the best way to go about this, for a situation as important as this, you will definitely want legal representation.
All the best.
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