Hello there Forgoodreasons and welcome to SR.
Your proactive steps (attending alanon, coming here) may have a positive influence on your family members...you are making first steps, opening up the floor for discussion, and showing them that guidence/support is out there, and (hopefully) getting healthier yourself.
BUT, that's all you can do! They'll have to be the ones who want help for themselves.
As you can see from all the posts here and also by what you witness in your own family - alcoholism truly is a family disease. I am glad you found SR
Hope you keep posting!