Her grandmother and my grandmother are sisters, can they get married?

Of course not.

Your grandmother's grandmother is a sister, and you can't get married!

But if you really love each other, you can go without getting a certificate and just live like this. If you can't have a BB, you will have a very serious illness.

It's a hidden disease in the family on your grandmother's side.

Consanguineous marriage refers to having a common ancestor within 3 generations, oneself is one generation, parents are the second generation, and grandparents are three generations. You don't originate from the same parents and grandparents. Strictly speaking, it is not considered a blood close relative within 3 generations, and it is considered a sideline.

But there are still risks associated with getting married and having children, but it's much smaller than getting married by real close relatives.

Never get married. Although they love each other, the marriage of close relatives will affect the next generation and even the younger generations, and there is a very high rate of various genetic diseases with no cure. Even if the next generation does not get sick, it does not necessarily affect people in the next generation.

For the sake of future children and grandchildren, I advise you to make a painful decision to break up. Never together.

The three generations of the direct line can't get married, and it turns out that there is a marriage inspection or something, and it will be directly said that it is better not to get married.

It seems that you can't be three generations.

The grandmothers of the two are sisters and cannot get married. Close relatives refer to relatives within five generations and three generations of collateral relatives who have a blood relationship, and the grandmother of Hu Yuanfang is a sister, which happens to belong to the eggplant state within three generations of collateral blood relationship. Children born of consanguineous marriages generally have deformities, mental retardation, disabilities and other phenomena.

His grandmother and your grandmother are sisters, you do not belong to the collateral blood relatives within three generations, and you can get married according to the law. However, although the law allows it, you are still very close by blood, and you should be cautious for the sake of the health of the next generation.

Legal basis: Civil Code of the People's Republic of China

Article 1048:Marriage is prohibited for lineal blood relatives or collateral blood relatives within three generations.

Article 1051:Marriage is null and void under any of the following circumstances:

a) bigamy; 2) Have a family relationship that prohibits marriage;

3) They have not reached the legal age for marriage.

Summary. Your grandmother is a sister, which means that you belong to four generations of collateral blood relatives (algorithm: from your generation, counting from your generation, you have to go back four generations to be your grandmother and his grandmother's common parents, that is, you and him, your parents and his parents, your grandmother and his grandmother, your grandmother's parents, are your common ancestors), so you can get married.

My grandma and his grandma are sisters, can we get married?

Your grandmother is a sister, which means that you belong to four generations of collateral blood relatives (algorithm: from your generation, counting from your generation, you have to go back four generations to be your grandmother and his grandmother's common parents, that is, you and him, your parents and his parents, your grandmother and his grandmother, your grandmother's parents, are your common ancestors), so you can get married.

Your grandmother is a sister, which means that you belong to four generations of collateral blood relatives (algorithm: from your generation, counting from your generation, you have to go back four generations to be your grandmother and his grandmother's common parents, that is, you and him, your parents and his parents, your grandmother and his grandmother, your grandmother's parents, are your common ancestors), so you can get married.

Legal analysis: If you belong to a collateral blood relative within three generations, you can't get married, otherwise, if you don't belong to it.

Legal basis: Civil Code of the People's Republic of China

Article 1046:Marriage shall be completely voluntary between a man and a woman, and neither party shall be allowed to coerce the other, nor shall any organization or individual interfere with it.

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

Article 1048:Marriage is prohibited for lineal blood relatives or collateral blood relatives within three generations.

Article 1049 A man and a woman who request marriage negotiation shall apply for marriage registration in person at the marriage registration authority. Where the provisions of this Law are met, they shall be registered and a marriage certificate shall be issued. The marriage relationship is established after the marriage is registered. Where marriage registration has not been completed, the registration shall be re-registered.

Article 1050:After marriage is registered, the woman may become a member of the man's family, and the man may become a member of the woman's family, in accordance with the agreement between the man and the woman.

Article 1051:Marriage is null and void under any of the following circumstances:

a) bigamy; 2) Have a family relationship that prohibits marriage;

3) They have not reached the legal age for marriage.