Speaking from my experience ..yes I am a diabetic
you can not get that under control as long as you drink.
As you probably know...diabetes is often called the silent killer.
Your entire body is at risk for complications.
Please take that seriously...
..living sober will help you.
Can you sucessfully taper? I think it's far too dangerous to consider.
A medically supervised de tox is called for...IMO
Sorry to know both you and your Dad are in bad health...
Glad you are planning to improve yours.