Hello jrc, and welcome. I'm so sorry for your situation, but I'm so glad you are here where you can get the support you need. As someone who was one of those embarrassed teenage daughters of an alcoholic, I can tell you that seeking support and help for your situation is a truly heroic thing to do.
One thing I want to say is that "functioning" is not a type of alcoholism, merely a stage. Left unchecked, alcoholism progresses over time, and no one can say how slow or fast that deterioration will be.
Have you met with a lawyer to discuss your options regarding having him in the home?