bamaridhi
Your wife's brother is your brother-in-law.
Brother in-law.
your brother in-law and your sister in-law
Lover
In the English language there is no difference between the wife of an elder brother and the wife of a younger brother or of a twin brother. The wife of any brother is your sister-in-law. If you are actually talking to her, however you should just call her by her name. Nicknames are fine too.
Calling her by her name would be okay. Ask her what she likes better.
Aunt
sister in law
what i call my father elder brother's wife
just call her by her first name, she is no relation to you.
Your Brother in law's wife
You should call her by her first name. You may refer to her in third person as your sister-in-law.