The simplest difference is that your surname is Tang and your surname is Biao.
In traditional ethics, relatives are fathers and relatives are mothers. Relatives have the same surname, and relatives (wife and mother) are physical surnames. Relatives belong to the same family, and relatives are cousins and consorts. Intimacy and affection are a pair, and inner and outer are a pair. My father's surname is my cousin, and my mother's surname is my cousin. Dad's brother is Bo, his brother is Uncle and his sister is Gu. My father and your mother's children are biological brothers and sisters, and my uncle's children are your cousins, also called uncles and brothers and sisters, and have the same surname as you. Although my father's sister (aunt) has the same surname as my father, and the children born after my aunt's marriage don't take her surname, they are cousins (although my aunt is a woman, she has the same surname as you, so my aunt is better than my aunt and my cousin is better than my cousin). Mother's brothers are called uncles and sisters are called aunts. They are all consorts (so mom's mother is also called grandma), and their children are cousins with you. Therefore, the same surname is the most important principle throughout. The same surname is one's own family, and the different surname is someone else's family.
If you can't tell uncle, uncle, aunt, sister-in-law, uncle, uncle, then simply distinguish between your children and your cousins with the same surname, and cousins with different surnames (except when the husband and wife have the same surname). Besides, there are brothers and sisters. A cell is a woman's uterus. Children born in the same womb are all compatriots, but they are not necessarily biological, because it may be that the mother's father is different. For example, if a mother remarries after giving birth to you and gives birth to a child, then the child is born in the same cell (uterus) as you. Although everyone's father is different, they are all the same mother and call each other brothers and sisters. Compare the motherland to a mother, and everyone who recognizes this mother can call each other compatriots. )
This is the distinction between intimacy and alienation in traditional ethics and etiquette. In fact, intimacy depends on feelings, and it depends on which relatives you have a good relationship with. And uncle tripterygium wilfordii in the sky and underground. My hometown is called my uncle (treating my uncle like a father), and many places in the country have the tradition and phenomenon that my uncle loves my nephew the most (note that my nephew also has the word' outside' here, because for my uncle, my mother and uncle are both. When a child (nephew) is born with a different surname from my uncle, my uncle will add the word "outside" in front of my nephew, call you nephew, and then kiss you. Etiquette should also carefully decide whether to kiss or not. Etiquette reflects that men are superior to women, and the level is high and low, which is dross, but loyalty, filial piety and honesty are the essence.