Sure, genetics do play a role in alcholism. You're more likely to be an alcoholic if one or both of your parents are also alcoholics. But that's just one part of the equation; the other part is your behavior. You can't become an alcoholic if you never take a drink. So if you know you're predisposed to addiction because of your family history, then just don't get started, and you'll never find yourself on that path.
Same with any other type of 'family curse.' If you parents smoke, don't pick up a cigarette. If your parents are obese, work hard to exercise and eat right so you don't follow in their foosteps. But some people find it easier to play the victim. They do whatever bad habits they want to because they think they have a built-in defense - "I grew up this way.
