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Abstract
Within-family differences that mediate the relationship between family history for alcoholism and alcohol consumption were investigated. Twenty adult children of alcoholics (ACOAs) and 20 children of social drinking parents (non-ACOAs) were interviewed in 1991 (mean age 24.2 years). Participants described family functioning while growing up and indices of their alcohol consumption. Family history for alcoholism had a direct association with two aspects of drinking. ACOAs reported more lifetime drinks and tended to report drinking more frequently during high school, as compared to non-ACOAs. ACOAs also reported more parental unpredictability, which in turn was associated with the above drinking indices. Finally, family history for alcoholism had an indirect association with drinking, as unpredictability mediated this relationship. Research and prevention implications are discussed.