Objectives: Previous studies have overlooked adolescents’ alcohol access in the home and social access through parents. This study was conducted to understand how drinking culture at home, parents’ views on adolescent drinking, and parents’ perception of recent adolescent drinking issues are related to the level of parents’ problem drinking and the permission of drinking for adolescent children. Methods: This study was a cross-sectional survey and conducted an online survey. A total of 362 parents who live in Seoul responded to questionnaires. Results: Despite the fact that parents knew that adolescents were vulnerable to alcohol, there was a tendency to keep alcohol at home where children could easily reach, and to drinking alcohol in the presence of children. This tendency was positively related with the level of parents’ problem drinking, but not with the permission of drinking for adolescent children. Parents wanted to drink their children late, but they supply alcohol to their children. This is because they thought that they could teach them to drink responsibly and provide a safe place to drink. Regarding the prevention of alcohol use in adolescents, there was a positive relationship between the level of parents problem drinking and raise alcohol price, but negative relationship between permission of adolescent drinking and increase of alcohol price. Conclusions: Parents and home-based efforts are needed to protect adolescent children from drinking.