Who is China's "in-house relative" in the traditional sense?

Internal relatives refer to relatives with the same surname, which is a clan (blood relatives, bone blood). Spouses are relatives of different surnames and in-laws, mainly referring to relatives of mother and wife. Confucius, an ancient scholar in China in the Tang Dynasty, commented on relatives like this: relatives within the family are relatives outside the family.

Uncle's daughter's children and uncle's children are consorts.

Extended data:

The origin of the word relatives:

China is the first country to form farming civilization. After settlement, they have real estate and cannot move away at any time like nomadic people and fishing and hunting people. Therefore, in order to maintain harmony and common development, tribes often form alliances, such as Yan Di tribe who is good at agriculture and Huangdi tribe who is good at handicrafts.

Marriage is a stabilizing measure of the alliance. After marriage, different relatives perform their duties. For example, my uncle, as the "speaker" of my mother's clan, has no right to inherit my father's property. So when brothers divide property, they need my uncle to preside over it. This is the origin of "mother's uncle is big".

But the ultimate goal of the alliance is for the development of one's own family, so the distance must be clearly defined. In the past, "uncle, uncle and aunt", three relatives who are neither related by blood nor belong to their own family, were called "three relatives". Of course, these are ancient bad habits, and now they are all pro.

Father's relatives and their surnames (uncle's children) should worship their ancestors in the same ancestral hall, so they are called cousins. Those who are far apart but still belong to the same family are called clansmen.

All equal relatives in the mother's family are called cousins, and their children are cousins because they are married to other families.

Baidu Encyclopedia-Relatives (Basic Meaning)