What should I call my sister's in-laws?

1, my sister's in-laws are called uncles and aunts, uncles and aunts, as long as they are not bad.

In written language, my sister's mother-in-law should be called in-laws, but in the north, when addressing my sister's mother-in-law, I need to address her according to her age. If your sister's mother-in-law is older than her mother, you can call her aunt. If she is younger than her mother, you can call her aunt.

3. In the south, they are all called aunts. In life, this relationship with my sister's mother-in-law belongs to in-laws relationship, and it is a kinship relationship mediated by marriage, which can be divided into blood spouse relationship, blood spouse relationship and blood spouse relationship.