Besides printing out the 10 ways, Under the Influence, Getting them Sober, and Codependent No More are really good books to help loved ones of alcoholics understand the disease dynamics and get educated about how to help. Of course there's no substitute for support through groups or a knowledgeable therapist either.
My knee jerk reaction would be to suggest your Father take back the family finances ASAP. I can tell you with 100% certainty that if I let my ex run the finances and hoped for a good outcome, I would be living in a box right now. There's an appropriate saying use here often, put the oxygen mask on yourself before assisting others.