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It is forbidden to marry a relative within three generations

A close relative (or kinship) is a common ancestor within three or more generations. If they are intermarried, it is called inbreeding. Inbreeding couples are likely to get the same genes from their common ancestors and pass them on to their children. Maybe many netizens are not very clear about the kinship of delicate marriage, so let's have a detailed understanding of it.


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To know what a direct relative is, you should first know what a direct relative is. Blood relatives, including natural blood relatives and prophylactic blood relatives. Natural kinship refers to a relative who is related to the same ancestor. Artificial blood refers to the blood contact, though not in fact but the law confirmation with the natural blood relatives with equal rights and obligations, such as the adoptive parents and adopted children, the parents and raised by the education of stepchildren.


Family relations prohibited from marriage: direct blood relatives


Direct blood relatives refer to the relations between parents and children, grandparents and grandparents, grandchildren and grandchildren. For example, fathers and daughters, mothers and sons, grandfathers and granddaughters, grandmothers and grandsons, grandmothers and grandsons are not allowed to marry.


(1) it is forbidden to marry a brother or sister of the same parent or father (half-parent) or mother (half-parent).


(2) uncle, uncle, aunt, uncle, aunt, nephew and nephew, nieces and nephews. That is, uncle (uncle) cannot marry the daughter of his brother (brother); The aunt could not marry her brother's son. Uncle can't marry his sister's daughter. The aunt could not marry her sister's son.


Reasons for the prohibition of interbreeding


When a close relative marries, it is easy to pass on physical and mental weaknesses and defects of one or both parties to the offspring, which is contrary to the preferential birth control policy in China. According to statistics, there are more than 1000 human recessive hereditary disease, such as the parents as relatives, its incidence of recessive gene 150 times above of incest, born infant mortality is also more than 3 times more. Therefore, the prohibition of marriage between close relatives is of great significance to improving the overall quality of the Chinese nation and promoting its prosperity.


Close table


The type of inbreeding and its coefficient of near marriage


Kinship type kinship degree near marriage coefficient (F)


One fourth of the first grade between parents and children


A quarter of siblings are siblings


Second order 1/8 between half of one's half-siblings who are half-siblings or half-siblings


The nephew and nephew are of the second order 1/8


Niece, niece, niece, niece, niece, niece, niece, niece, niece, niece, niece, niece


Cousin between the third grade 1/16


Cousins are level 3 1/16


Half a cousin between four 1/32


Level 2 Cousins (from Cousins) between level 5 1/64


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If it is a recessive gene on the X chromosome, because women have two X chromosomes, may be obtained from a common ancestor homozygosity genotype, while men are half a zygote, there is no problem of homozygous, so the relative marriage has no effect on the boys. Or, if a gene is a x-linked recessive, cross-cousin sibling or cousin marriage won't pass the disease to their children, but my uncle Cousins or maternal cousin brother and sister after the marriage x-linked gene is genetic risk for euchromosome is big.


The effect of inbreeding on offspring is mainly manifested in the increased incidence of recessive genetic diseases, and the increased risk of congenital malformations, premature births and miscarriages, and infant mortality. When evaluating the harm of inbreeding to a group, the average near marriage coefficient (expressed as a value) should be calculated based on the investigation of various kinds of inbreeding. The greater the a value, the greater the harm to the group. Generally, a value of 0.1 (i.e. 1%) is a high value. Generally, in developed and open societies, the a value is lower, while in closed, isolated or special customs societies, the a value is higher. From 1980 to 1981, China's survey of the han population in Beijing showed that the rate of inbreeding was 1%, and the average coefficient of near marriage was 0.1%


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