The participatory design is one of the foundations of this project, and young adult participants will be consulted through out the research project. PsYoungSupport is a research program comprising three phases, Phase I is a survey of young relatives' and close friends' needs for internet based information, education and support, Phase II is the development of a website, and Phase III is an intervention based on the previous phases. The aim of phase III is to evaluate the effect of an internet based intervention containing information, education and support for young adults in families where a family member suffers from mental illness or functional disability. The participants (N=400) will be randomised to two groups with different kinds of support. The participants will be evaluated using self-questionnaires and web interviews at the following occasions: baseline at the start of the intervention, after 4 months and after 8 months. This project will have implications for persons suffering from mental illness as well as for their relatives and close friends.