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 two links so that you may understand what I mean:

[“Co-brother” or “co son-in-law?”](https://englishwithsunil.wordpress.com/2007/11/08/co-brother-or-co-son-in-law/)

<https://en.m.wiktionary.org/wiki/co-sister-in-law>

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