Xjyuk

Indians especially have a tendency to use the terms co-son-in-law and co-sister-in-law while referring to relations.

1. The husband of one's wife's sister is called Co-son-in-law.


2. The wife of one's husband's brother is called co-sister-in-law.

While introducing the relations to others they are called so.

The terms may be understood in the Indian sub-continent. But such terms are not understood by the native speakers.

I searched on the internet for the equivalent terms in English but I could not find them.

I here with attach a link so that you may understand what I mean:

“Co-brother” or “co son-in-law?”

What are the equivalent terms used by the native speakers while introducing them (the mentioned relatives) to others?

In US English (and likely most non-India regions), we refer to these persons as simply brother-in-law or sister-in-law. My wife has a sister, and that sister is married. I refer to both husband and wife as my brother and sister-in-law.

In the same way, my mother has a brother who is married. I refer to both husband and wife as my aunt and uncle. In both cases the spouse becomes referred to as the same relationship. We would know from the social context that "aunt and uncle" refer to wife and husband rather than brother and sister, and we would therefore know that only one is a blood relation. In the same way, when "brother and sister-in-law" refer to a married couple, we know the actual relationships.

EDIT: The expression "co-son-in-law" would seem to contradict US English usage. Brother/sister-in-law refers to someone of the same generation as yourself. Son/daughter-in-law refers to someone of the same generation as your child and NOT the same generation as yourself. My daughter's husband is my son-in-law, so I would have expected co-son-in-law to mean something similar. But I gather it does not!

1. The husband of one's wife's sister is called Co-son-in-law.




2. The wife of one's husband's brother is called co-sister-in-law.

In the United States, the husband of your wife's sister is called your "brother-in-law". Note that we use the same term for the husband of your own sister.

The wife of your husband's brother is you "sister-in-law". This is the same term we use for the wife of your own brother.

I had a conversation once with a speaker of some Indian language — Hindi maybe? — who said that his native language had many more different words for different relationships that in English we use the same word for. Like he said that in his language there were separate words for your father's mother and your mother's mother, while in American English we call them both "grandmother".

When we need to distinguish, we describe the relationship. Like if I said, "George is my brother-in-law", someone might ask, "Do you mean your sister's husband or your sister's husband's brother?"

I would like to answer not because I did not understand what you have explained but because I think it is the best occassion to share our cultural differences or even heritage.

I belong to the south of India and my mother tongue is Telugu.

I have three brothers and one sister and I am married.

I call my wife's sister's husband as younger brother and he calls me elder brother because I am the elder of the two. But while introducing to others we call each other co-son in law such as He is my co-son-in-law..

Regarding my brothers' wives we call them sisters-in-law.

My wife's brothers are addressed as brothers-in-law.My sister's husband is also called in the same terms

My mother's brother is called maternal uncle and my father's brother is called paternal uncle.
My wife's father is called Father-in-law in English.Of course there are different terms in our mother-tongue for the said relations.

We call the mother of father and mother as grand mothers (paternal grand mother and maternal grand mother) in English but they are called in the sense of mother's mother and father's mother in our mother-tongue.

The difference seems to be the usage of co-sister-in-law and the co-brother-in-law which are not used in native English speaking countries.

I thank those two Americans who were kind enough to answer very promptly