Using data from Programme for International Student Assessment (PISA) developed by the Organisation for Economic Co-operation and Development (OECD), this study examines the social disparity of family involvement. A total of 4,405 students from 140 Hong Kong secondary schools participated in the first cycle of PISA study identifying four types of family involvement: cultural communication, social communication, homework supervision, and cultural activity. Multi-level analysis was used to examine the major family factors related to these types of family involvement. Consistent with previous research, working-class, immigrant, and single-parent families tend to have lower levels of parental involvement. The effect of these structural factors decreased after family resources, family network, and family norms entered into the multi-level regression model. It can be argued that the social disparity of family involvement is mediated by the deprivation of useful resources, lack of network, and low educational aspiration of the disadvantaged families. The results also suggested that it is not only cooperation between home and school, but also connection between parents and their children's peers that provides the necessary chemistry for success. Educators, parents, and policymakers should be aware that family networking should be extended to include the peers of the teenagers if they want to enhance family involvement in education. (Contains 5 tables and 2 endnotes.)