Your husband's Brother would be your Brother-in-law. Some people feel that his wife would be your Sister-in-law, other people feel his wife should be called "My Brother-in-law's Wife".
I prefer to call her my Sister-in-law.
Perhaps you could ask her what she'd prefer to be called.
Sister-in-Law
Brother-In-Law means a wife or husbands brother and its your husband or wife's brother
Your brother would call your husbands sister by her first name. Or, "my (sibling's) sister in law.
You would call your husband's younger brother a brother-in-law.
what i call my father elder brother's wife
brother in law
Your wife's brother is your brother-in-law.
Your Brother in law's wife
Your wife's brother would be called "brother-in-law".
younger brother's wife -- maradalu elder brother's wife ---vadina
The brother of your wife's cousin is also her cousin. You can call either of them "my wife's cousin." You are not related to them.
what i call my father elder brother's wife