What is the relationship between cousins?

My uncle's daughter is called "cousin" in the eldest and "cousin" in the younger, belonging to my cousin.

Menstrual daughters, the older ones are called "cousins" and the younger ones are called "cousins", belonging to cousins.

Simple distinction between "cousin" and "cousin";

"Cousin" refers to relatives related to their paternal line. "Tangqi" can be divided into "close relatives" and "distant relatives".

"Kinship" refers to relatives who originated from grandfather. Including father's brother (uncle) or children of father's brother (uncle), they are collectively called "cousins", and then they are called "cousins", "cousins" and "cousins" according to age and gender differences. The above cousins have the same grandfather as themselves.

A "cousin" refers to a relative linked by a mother's brother or sister or a father's sister. Cousins can be divided into cousins and cousins.

The children of themselves and their parents and sisters are called cousins; The children of themselves and their mother's brothers and sisters are called aunts and cousins (aunts, brothers and sisters, and sisters from their mothers). In addition, parents' cousins and mothers' cousins are also cousins.