My parents were alcoholics as they grew up in the coal mining areas of eastern Pennsylvania where miners drank heavily. Both grandparents on my Dad's side died of alcoholism under 45 years old (I have the death certificates). On the other side, my grandfather's cause of death is unknown to me, but he died early too. Grandma on that side never drank and made it into her 80's. Except for her, the other grandparents were dead before I was born.
I left home at 17 as home life was not pleasant. My sisters left as soon as they could too.
My Dad died of cirrhosis of the liver at 62, doing a full quart of vodka each day (minimum). The liquor store was right across the street from their rented house and delivered. Mom had a stroke at 60 and that seemed to stop her drinking and she lived to be 83, eventually dying of kidney failure.
One of my two sisters was an alcoholic and died at 55 from cancer. The other is OK and never drank.
I was following in my father's footsteps but saw the writing on the wall and quit cold turkey 20+ years ago (it was not easy). Both of my daughters inherited the same gene that connects you to compulsive addition and one daughter passed away at 22 years of age (opioid addiction) and the other is still OK and clean for the last 10+ years. Fortunately, I have no grandchildren as if I did they may be predisposed to an addiction too. With these kinds of family genes, generations of family members can be affected with addictive behaviors.
This stuff is tough and can ruin families.