ZWH,
In case you didnt get an answer to this yet a "sponsor" is someone in AA or NA that has been through the same thing your Dad has and can help him through the tough times. But like everyone else said your Dad has to be willing to reach out and get help.
He is the only one that can make these decisions.
The best thing that you can do for your Dad right now is to take care of yourself
as much as you can. You need to get help for yourself to help YOU through this.
Your Dad is a lucky man to have such a loving and caring daughter. But again,
he is the only one that can make these decisions.
Love and prayers Zwh!
Bob