Four generations under one roof means that the four generations of great-grandfather, grandfather, father and son are all alive and living together. Tongtang means living in the same house; living in the same family. The idea of ??four generations living under the same roof originated from the ancient Chinese book "Three Character Classic". The original text is: "The great-great-grandfather is born as a father, his body is a son, and his son is a grandson. From descendants to Xuanzang, there are nine tribes, and the ethics of human beings."
Four generations of ancestors and grandchildren: the four adjacent generations among the nine generations of great-grandfather, great-grandfather, grandfather, father, self, son, grandson, great-grandson and great-great-grandson can all live under the same roof.
The Three Character Classic is China’s traditional enlightenment textbook. Among the ancient Chinese classics, "The Three Character Classic" is one of the easiest to understand. The "Three Character Classic" draws on classic materials, including literature, history, philosophy, astronomy and geography, human ethics, loyalty, filial piety, justice, etc. of traditional Chinese culture, and its core ideas include "benevolence, righteousness, sincerity, respect, and filial piety."
The Three-Character Classic, the Hundred Family Surnames, and the Thousand-Character Classic are also known as the three major enlightenment books on Chinese studies. The Three Character Classic is a precious cultural heritage of the Chinese nation. It is short, concise and catchy, and has been well-known to every household for thousands of years.