Should one with such relatives avoid ever even trying alcohol? 'Cause it's triggered immediately once you feel the effects of the drug IMO. I've heard alcoholics say they were "addicted" from the first time they touched the stuff. But then it's sort of unreasonable to expect people to never even try drinking a few beers. It's like you're fucked whatever you do if you have the predisposition.
Alcoholism and addiction is a disease. Some people have it some dont. People from the same family can be fine, while other family members have horribly addictive personalities.