What is the relationship between relatives in the table and between tables?

Cousins refer to their uncle's sons, and cousins can be divided into "relatives" and "distant cousins". "Cousin" refers to a cousin who has the same grandfather as himself, while "distant cousin" refers to other cousins who are not the same grandfather but have the same blood relationship.

Cousins, also called cousins, refer to the children of their father's sister or their mother's brother and sister. Cousins can also be divided into relatives and distant relatives. If you are your father's brother or sister or your mother's brother or sister, you are a cousin, otherwise you are a distant relative.

Cousins and cousins are related by blood. I might as well tell you something.

Blood relationship can be divided into direct blood relatives and collateral blood relatives.

Lineal blood relatives are relatives who have a direct relationship, that is, people who have given birth to themselves and their descendants. Both parents are included. For example, parents and children, grandparents and grandchildren, grandparents and grandchildren.

Collateral blood relatives are relatives with indirect blood relationship, that is, relatives who are not lineal blood relatives but are of the same ancestry. Collateral blood relatives within three generations refer to relatives who have blood relations with themselves within three generations. The three generations here are three generations counting from themselves. For example, 1, brothers and sisters come from their parents, and they are the first generation, and their parents are the second generation, so brothers and sisters are collateral blood relatives within the second generation; 2. My uncles, aunts, cousins and myself are grandparents. I am the first generation, my father, uncles and aunts are the second generation, grandparents are the third generation, and these relatives are all the third generation, so I am collateral blood relatives within three generations. 3. My uncles, aunts, cousins and I belong to my grandparents. I am the first generation, my mother and uncles and aunts are the second generation, and my grandparents are the third generation. These relatives are all the third generation, so I am collateral blood relatives within three generations.