text: Tày customs were altered greatly due to Vietnamese and Confucian patriarchal structures, however some customs persisted. Polygamy with multiple equal wives and legitimacy of issue was practiced. Marriage was preferred to occur within the clan. Young wives lived with their parents until giving birth to their first child. Tày women, like those of the Nùng and Zhuang, were said to have used poison to seek revenge when wronged.
  The Tày and Nùng often intermarried, although the Tày seem to have held higher status in these relationships. Tày men married Nùng women more often than the other way around. Some Nùng groups were probably absorbed by the Tày.
  Religion
  The majority of the Tày practices Then, an indigenous religion involving the worship of tutelary gods, gods of the natural environment, and ancestors and progenitors of human groups. The patterns of this religion are inherited from Taoism and the Chinese folk religion: the god of the universe is the Jade Emperor, in some local traditions (for example in the Quảng Hoà district of Cao Bằng) also identified as the Yellow Emperor (). For their religious ceremonies they used to be able to recite Chinese characters but now along with the characters they use glosses because many of them can't recite anymore due to the fact that Vietnamese schools don't teach Chinese characters.