Parents-in-law refer to the parents who call the woman by the man. The man's address to his wife's father-in-law, mother-in-law and mother-in-law is the most formal and extensive address to his wife's parents, but in history, father-in-law and mother-in-law have always been called "uncle", "aunt", "father-in-law" and "mother-in-law".
In our country, the more formal names for the wife's father are father-in-law, father-in-law and father-in-law. Generally, these formal names are used when introducing or mentioning the wife's father to a third party.
After two people get married, the wife and the man have become a family. Therefore, the wife's parents naturally become the man's parents. Usually when introduced to others, they are called parents-in-law.
Family relations
When two people get married, their parents' names will change. Generally, the woman's parents will call the man a son-in-law, and the man can call the woman's parents directly. This is more appropriate, because the wife and the man have become a family, and the wife's parents naturally become my parents, but they can also be called parents-in-law.
The child calls his mother's father: grandpa, or grandpa. Different places have different names. Generally, people in rural areas are called grandpa, while northerners or southerners are called grandpa.
Children call their mother's mother: grandma, or grandma, also called grandma, is the mother's immediate family, the mother's previous generation, and the mother's elder.