Consanguineous marriage is an act of marriage between direct or collateral blood relatives within three generations. China's Marriage Law explicitly prohibits consanguineous marriage. Marriage between close relatives is an illegal act and is not allowed to be registered by the marriage registration authority. If the registration is obtained by concealing facts and the marriage is invalid, it belongs to one of the legally stipulated situations of invalid marriage, and the court has the right to revoke the marriage.
Why is marriage between close relatives prohibited
1. The harm of consanguineous marriage is significant, and the offspring of both parties are prone to developing malformed children or other genetic diseases.
2. Marriage between close relatives can greatly increase the probability of recessive genetic diseases. According to relevant data, the incidence of recessive genetic diseases in offspring of consanguineous marriages is 150 times higher than that in offspring of non consanguineous marriages. The incidence rate of genetic diseases in consanguineous marriage is higher than that in non consanguineous marriage.