In traditional Chinese family culture, descendants of several generations from the same ancestor lived together and formed a big family system. This kind of autonomous family system was the basic unit of traditional Chinese society. Chinese children follow their father's family name. This is the same as western culture. Nowadays in China it is legally fine for a child to follow either father's family name or mother's family name. Within each family system, of course people except those who joined this family system through marriage all have the same family name.