She is a sister in law.
There is no specific word for the husband of your wife's sister. If you need a phrase, call him your "sister-in-law's husband."
Call her Sister.
Your brother's wife is your sister-in-law.
Your brother's wife is your sister-in-law. You would refer to her and treat her as if she were your sister.
The sister of your husband is your sister-in-law.
You would call your wife's elder brother's wife "sister-in-law."
i believe that your brother's wife's sister is also your sister in law No, I think not! But as you seem to have the hots for your brother's wife's sister, you can call her "honey" if you like.
You would call your wife's sister your sister-in-law. If your wife would have a brother he would be your brother-in-law. It is the same thing for a husband's siblings. Your wife's mother would be your mother-in-law. Her father would be father-in-law.
Sister-in-Law
Attige
In Kannada, you can call sister-in-law as "ಅತ್ತೆ" (atte) if she is your brother's wife, and "ಸಹೋದರಿ" (sahodari) if she is your sister's husband's wife.
Your younger brother's wife is your sister-in-law. Your older brother's wife is also your sister-in-law. In English, we make no distinction between the two. However, when talking to your sister-in-law you do not address her as sister-in-law. You just call her by her name.