A Chinese kin, lineage or sometimes rendered as clan, is a patrilineal and patrilocal group of related Chinese people with a common surname sharing a common ancestor and, in many cases, an ancestral home. Chinese kinship tend to be strong in southern China, reinforced by ties to an ancestral village, common property, and often a common spoken Chinese dialect unintelligible to people outside the village. Kinship structures tend to be weaker in northern China, with clan members that do not usually reside in the same village nor share property. A zupu () is a Chinese kin register or genealogy book, which contains stories of the kin's origins, male lineage and illustrious members. The register is usually updated regularly by the eldest person in the extended family, who hands on this responsibility to the next generation. The "updating" of one's zupu () is a very important task in Chinese tradition, and can be traced back thousands of years. After several generations, the local clan lineage will often publish a compendium of these zupus. The overwhelming majority of zupus remain in private hands, though a large number may be found in the Peking University, Shanghai Library, Cornell University and Tōyō Bunko. Chinese lineage associations, also kinship or ancestral associations ( or ), are a type of social relationship institutions found in Han Chinese ethnic groups and the fundamental unit of Chinese ancestral religion. They gather people who share the same surname belonging to the same kin, who often have the same geographical origin (ancestral home), and therefore the same patron deities. They are not seen as distinct from the Chinese kin itself, but rather as its corporate form. These institutions and their corporeal manifestations are also known as lineage churches or kinship churches (; ), or, mostly on the scholarly level, as Confucian churches, although this term has principally other different meanings. Chinese kinship associations are the corporate forms of kins and the fundamental unit of Chinese ancestral religion.