 Alcohol and drug problems are present in families from all walks of life. The lives are all-sided, complex, and unique to each family and individual. With this in mind, we still need a general picture in Denmark of the problem, and that is the aim of my PhD project to look into the scope of the problem. But how can we make young people talk about such a personal problem, which is often a secret outside the family, and related with a lot of stigma and taboo? We use survey as a safe and anonymous place for young people to report if their father, mother, or both of the parents have or have had alcohol or drug problems. But it's not enough to address the problem with dark figures and unreported numbers, because we know the most the socially exposed do not participate in survey research. So we combine the survey data with a lot of registered data on not only the participant, but also the non-participants, as well as their parents. So using these data sources, we hope to get a general picture of the problem in Denmark. And this was done by three analyzers. Firstly, I estimated the prevalence of young people who have experienced the appearance to have alcohol or drug problems. And the results show that 15% of young Danish adults have experienced this kind of problem. So this actually means every seventh young Danish person in Denmark. Secondly, I'm looking into the schooling performance and how they are doing compared with their peers. We know from existing research that they are experiencing more troubles and conflicts with classmates and teachers. But I would also like to look into the protective factors for those who are actually doing well in school. Lastly, I am going to look into different family structures and how they relate with different problems, and also consequences for the young persons. I hope my project to be relevant for practice and policy, and to create more knowledge about this issue. The next step for my PhD is to support a discussion of how the surrounding society, such as educational institutions, helping system, social services, can meet the parents and the young adults in their complex, all-sided and unique lives. So thank you for your attention.