Many children and adolescents get their first experience with alcohol in a family setting. Evidence suggests that parental supply of alcohol is a risk factor for drinking later in life. However, most of the previous studies have been conducted in Western countries. The Czech Republic has among the highest alcohol consumption per capita, including among adolescents, and providing own children with sips of alcohol is widely considered a good way for introducing them to safe drinking. This study examined whether the parental supply of alcohol is associated with later use among adolescents in an Eastern European alcohol-permissive context.