The answer to your question, "How do I protect properties and myself if my alcoholic housemate hurts someone?" is to not co-own anything with her, including the house and car. In addition, have her obtain her own car insurance. If your ex-girlfriend does cause a car accident while driving drunk, you would only be liable if you, yourself, were negligent. You might be negligent if you had her run an errand for you when you knew she was drunk. Otherwise, if you are not negligent, you likely would not be responsible for any damages she causes. However, if she causes damages in excess of the insurance coverage, the person she harms can, assume they obtain a judgment and follow legal procedure, attempt to seize the vehicle and house and have them sold to satisfy the judgment. If you co-own these with her, you would then likely lose them when they were sold. You would still get some money from the sale, in proportion to your ownership interest, but you could lose the house or vehicle.
Answered on Sep 07th, 2012 at 3:15 PM