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=== Polygamy === Polygamy (specifically polygyny) had been practiced in Chinese societies for thousands of years. Since the Han dynasty, Chinese men have been able to legally have only one wife. It was common for privileged Chinese men to have a wife and various concubines, however. For those who could afford a bride price and support a family of multiple concubines and children, polygyny provided a better chance of issuing heirs. The importance of this was apparent in the imperial court, which usually housed hundreds of concubines. Aside from concubinage, having multiple wives with equal status was also accepted prior to the ban on polygamy. In a concubinage situation, the wife, concubines and their children would live in the same household. Wives and concubines would often refer to each other as "sisters". As a concubine was not wedded in a marriage ceremony, she had fewer rights in the household. There was also no inter-clan relation between the man's clan and the concubine's own kin. Polygamy was banned in China in 1930 when the Republic of China government promulgated Civil Code (Part IV) where Section 985 states "A person who has a spouse may not contract another marriage. A person shall not marry with two or more persons simultaneously." This is still in effect today in the territories under effective administration of the Republic of China including Taiwan and Kinmen and Matsu. However, as infringement of marriage cannot be prosecuted without a complaint by the wife, one can still unofficially practice polygamy by registering only one marriage. Such practice still happen occasionally among older and wealthy men. After the establishment of the People's Republic of China by the Chinese Communists on the mainland, this banning was reaffirmed in the passage of the Marriage Code of 1950. In Hong Kong, new polygamous marriages were no longer legally allowed after 1971 with the passage of the Marriage Reform Ordinance (Cap. 178). Due to this, incidents of extramarital affairs rose. Some men have even established a family with their mistresses and children kept secret from their wives. There is a phenomenon of cross-border polygyny usually involving Hong Kong men and their mistresses living in mainland China.

== Demographics == With modern Chinese governments advocating smaller families through family planning campaigns and policy-making, large extended families may be a thing of the past. The People's Republic of China introduced its One-child policy in 1979, and The Family Planning Association of Hong Kong began its "Two is enough!" (兩個就夠哂數!) campaign in the 1970s. Contrasted with the large extended families created during the pre-war and baby-boom years, average modern Chinese families now have many fewer children. As of 2006, the fertility rates in Hong Kong and Macau ranked among the lowest two in the world. Hong Kong, ranked the lowest in the world, was the only territory with less than one child born per woman on the average. Both Mainland China and Taiwan were ranked well below the world average. Similarly, the birth rates in Hong Kong and Macau ranked among the lowest three in the world. Both Mainland China and Taiwan were ranked below the median. A product of rising divorce rates in Chinese societies is the breakdown of the traditionally close-knit kinship relation. On the other hand, remarriage could provide more than two sets of paternal or maternal relatives.

== Defining kin ==

=== Nine grades of relations === The "nine grades of relations" (九族) is an important concept when it comes to application of laws and observing rituals. Since the Han dynasty, there have been two separate interpretations of what is defined by the nine grades. Each interpretation is based on societal and political needs as the ruler of the day see fit. The "older" interpretation ("古文說") defined the nine grades of relations strictly in the paternal line. That is, nine generations from great-great-grandfather down to great-great-grandchildren. This interpretation was officially recognized after Tang and Song dynasties. By Ming and Qing dynasties, laws have defined the patrilineality of the nine kindreds. This interpretation was cited in Part III Chapter 2 of Lewis Henry Morgan's 1877 book Ancient Societies. The "contemporary" interpretation ("今文說") defines the nine grades of relations to be four generations from the paternal line, three from the maternal line, and two from the wife's. Historically, this definition has been used during award, punishment and family annihilation. Yet another interpretation suggests that "nine" is actually an arbitrary number as nine is considered a large number in Chinese culture. As such, it means anyone and everyone related is to be executed in the context of family annihilation.