Ethics is an area of social and spiritual life, which born from the practice of social relationships between people. It encompasses all notions and beliefs held by humans on morality, conscience, duty, happiness, justice, and other related topics that associates with rules of evaluation, adjustment, and orientation and human's behavior in that society. For that reason, morality, as a type of social consciousness, always represents distinct facets of the social existence of humans. Which is the value that elevates human virtue as the aim and focal point of growth and a gauge of civilization, emphasizing its role, goodness in the core of the human soul and the advancement of human civilization so the Southern Khmer people in Vietnam always take “Ethics” as the foundation and center of organizing, building, and developing society in their educational philosophy. Starting from the above reason, in this entire article, the author only focuses on researching the moral education philosophy of the Khmer people of Southern Vietnam in family relationships to see the diversity deeply rooted in the cultural traditions of a community with a long history of settlement and birth in Vietnam. For the reasons outlined above, the author only focuses on researching the philosophy of ethical education of the Khmer people in family relationships to see the diversity and depth in a group of people who were born and have lived in Vietnam for a long time.