Offspring reported on all siblings independent of whether the sibling participated in the study, (65% had one or more siblings participating in the survey). Using the excessive and problem use questions from the FHAM, offspring who reported siblings were ever excessive drinkers or that drinking ever caused their siblings problems with health, school, family, police or other problems were coded as having a sibling who was a problem/excessive drinker. Similarly, offspring reports of sibling use of marijuana, cocaine, stimulants, opiates, hallucinogens, PCP, sedatives, solvents or inhalants were used to code sibling drug use status.
