You cannot go on supporting your alcoholic father endlessly, at some point you have to put your foot down and let him realize that you will not be there always to shoulder his responsibilities. Rather than depending on your family, start searching for a boy on your own. Also just make your would be husband aware of your financial responsibilities and not about your family history in detail. Also make it very clear with your father that you will support him for initial 3-4 months after your marriage, after that he needs to manage on his own.