This article introduces the formation basis of clans in Vietnamese social organizations, namely blood and marriage relationships, and how these clans have become important forces in promoting social and historical development. At the same time, the unique cultural traditions preserved by Vietnamese families, especially the culture of worshipping those who have made contributions (known as the "posterior"), were explored, emphasizing the importance of studying this cultural phenomenon for understanding Vietnamese history and culture.

1. Vietnamese Family and Sacrificial Merit (Later) Culture

Vietnamese family culture is rich and diverse due to the settlement of multiple ethnic groups. The Jing ethnic group respects their ancestors, and ancestor worship is an important component of their culture. Before the Northern period, Vietnamese family organizations were influenced by the matrilineal system, with women dominating. After the Northern period, influenced by Han culture, Vietnamese surnames emerged, combining ancestor worship with Confucianism. In the later period of the Li Dynasty, ancestor worship became popular, Confucianism was advocated by the state, and inheritance rights were stipulated by law. During the Nguyen Dynasty, the Confucian family organization model became popular, and property distribution tended towards fairness. The Vietnamese family model has different impacts on different social classes, with wealthy official families leaning more towards the Confucian model, while ordinary families rely more on local customs. The clan leader holds an important position within the family, but their power is limited. Family worship activities are mainly held in ancestral halls, and the objects of worship include ancestors, the Earth God, and the Kitchen God. In the Vietnamese culture of worshiping meritorious individuals, those who have made contributions to the court or village religious belief groups will be worshipped, known as "post worship". The phenomenon of post worship holds an important position in Vietnamese culture, but with the changing times, this tradition has gradually declined. As a unique phenomenon of faith, post establishment faith has received attention from scholars in recent years. Hou Bei occupies an important proportion in Vietnamese inscriptions, reflecting the profound influence of Hou Si activities on the lives of the Vietnamese people. The study of post establishment activities mainly relies on literature such as inscriptions and historical books, while there are relatively few records of election documents related to the "post clan", making it difficult to become the main research material.

2. Main materials for the study of the culture of the Later ethnic group: Inscriptions on the Later ethnic group

In depth exploration of the main material for the study of Vietnamese ethnic culture - ethnic inscriptions. The article first introduces two different views on the "post" inscription: the only famous school and the only realistic school. The Yogacara school believes that only inscriptions with the word "Hou" in their name or content can be considered as "Hou" inscriptions, while the Realism school determines the research object based on the essence of the inscriptions recording merit, donation events, and reward content. The article points out that the research results of the pragmatists are more convincing and have received more support from scholars.

Postscript Inscriptions and Research Prospects of the Third Generation

The inscriptions on the ancestral tablets record the information of the donors, the revered descendants, and a brief history of their families, providing clues for studying historical figures, family history, local history, and social history. The opening text of an inscription is an important material for studying East Asian biographies, celebrity history, social history, and micro history. For example, the "Inscription on Ji Ji" records the donation situation of the Ge family in China, revealing the family's history and kinship. The inscriptions of the Later Tribe also recorded the amount of donations, sacrifices, and the way of holding the anniversary, providing information for the study of Vietnam's economic history, cultural life, and beliefs. The "Inscription on Ji Ji" provides a detailed list of the offerings, quantities, and values required for ethnic mourning days after 1900, which has reference value for understanding the value of Vietnamese currency, price levels, and economic conditions at that time.

4 Conclusion

The tradition of ancestor worship in Vietnam was prominent among the royal family from the 11th to the 14th century and was influenced by Confucianism. The Confucian model was popularized in ordinary families from the 15th to the 18th century, reaching its peak in the first half of the 19th and 20th centuries. Vietnamese family culture is shaped by both Confucianism and local customs, maintaining diversity. Worshiping the descendants is a unique feature of Vietnamese family culture, and studying the worship culture of the descendants can help deepen our understanding of Vietnamese family beliefs and cultural life. The inscriptions of the Later ethnic group are precious materials for studying the sacrificial culture of the Later ethnic group, containing rich social and micro historical information, which helps to deepen the understanding of Vietnamese family cultural life and beliefs.