The purpose of this study is to critically review moral principles between parents and children reflected in Samguk Yusa(三國遺事). The method used is the historical method and the literature for the analysis is Samguk Yusa. According to the analysis, the relationship between parents and children are composed of the many cases of filial piety. They include a) filial piety through Buddhist mass b) filial piety through self-sacrifice c) the dilemma between entering the priesthood and fulfilling filial piety to the parent. The family moral principles reflected in a) and c) reveal two-way interaction between parents and children but b) one-way relationship to the parent from the child. Thus, it was found that there coexisted one-way and two-way relationship between parents and children in Samguk Yusa. Accordingly, if positive aspects of the moral principles between parents and children reflected in Samguk Yusa are modernized, it is suggested that they will compensate weaknesses of the modern Korean family ethics regarding parent-child relationship.