The Civil Code prohibits intergenerational marriage.

Legal analysis: Article 1047 of the New Civil Code of People's Republic of China (PRC) clearly stipulates that marriage is prohibited between lineal blood relatives and collateral blood relatives within three generations. It is forbidden for a certain range of relatives to get married, which stems from the marriage taboo in primitive society. After entering individual marriage, human beings consciously restrict consanguineous marriage through legislation for the reasons of eugenics. Affected by genetic genes, if the husband and wife are too close in blood, it is easy to pass on physical and mental diseases or defects to the next generation, which will bring harm to national health, population quality and human development. Second, based on ethical requirements. Because consanguineous marriage violates ethical education, hinders the long-established marriage morality of human beings, and easily leads to the disorder of kinship and inheritance. Therefore, all countries in the world have a legislative tradition of prohibiting a certain range of relatives from getting married. The range of relatives who are forbidden to get married as defined in this article is specifically: (1) lineal blood relatives. Lineal blood relatives include parents and children, grandparents and grandchildren, great grandparents and great grandchildren. (2) collateral blood relatives within three generations. Collateral consanguinity within three generations refers to the indirect consanguinity from the same grandparents, including brothers and sisters with the same father and mother, half-brothers, cousins, uncles, aunts, nephews (daughters) and so on.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 1047 The age of marriage shall not be earlier than 22 for men and 20 for women.

1048th lineal blood relatives or collateral blood relatives within three generations are prohibited from getting married.