The law in our country prohibits marriage between close relatives, which refers to the prohibition of marriage between direct blood relatives and collateral blood relatives within three generations.
1、 Direct blood relatives
Marriage is not allowed between parents and children, grandparents and grandchildren, or between grandparents and grandchildren.
2、 Collateral blood relatives
Starting from you, your own generation, your father (mother) is the second generation, and your grandfather (grandparents) is the third generation. If the common ancestor of both men and women is within three generations, marriage is prohibited. If it is outside of the third generation, the law allows it.
1. One's own brother and sisters cannot marry.
2. Relationships between uncles (aunts) and nephews (daughters), uncles (aunts) and nephews (daughters), cousins (sisters), and cousins (sisters) cannot be married.
3. Brothers and sisters who are of the same origin as their parents (including half siblings and half siblings), that is, children of the same parents cannot marry each other.