That had to be so hard for your mom to see him sober and functioning well when she might have had that with him if he'd woken up sooner.
My ex has been sober for 3 years with the help of AA but I have this feeling all the time that he will go back to that life.
Addiction of any kind affects the whole family and the fallout can be bad news. My other children all paid a price for their sisters addiction.
Now, my grandchildren had to grow up without their mother. When I allow myself to think about too much I am shocked at what we all go through. Then, I get angry with her and there's no profit in that. Too late.
Thanks for telling me "the rest of the story" about your dad.