I suggest you call a real estate attorney in your county, who doesn't know your dad, and get some free advice from them. If you both are on the deed, you dad might not be able to sell the house out from under you. Also, if you have a MI and are not of 'sound mind', there might be some legal issue in whatever contracts you have. Just ask the attorney about what you can do to protect your interest in the house and if you dad can put you into the street.