The wife of your brother (younger or older than you) is your sister-in-law.
Brother in-law
younger brother's wife -- maradalu elder brother's wife ---vadina
You would refer to your younger brother's wife as "bhabhi" in Hindi.
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.
In English, the wife of your brother (elder or younger) is your sister-in-law. If you have a child, she is your child's aunt.
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.
In Malayalam, you call a younger brother "Chettan."
You would call your husband's younger brother a brother-in-law.
Your husband's brother's wife in Tamil would be referred to as "மாமிகள்" (mamigal).
Your brother's wife is your sister-in-law. It is appropriate to call her by her first name, however, if you want to use a diminutive of her name (ie calling Elizabeth Beckie), please check with her first. Some people are not comfortable, nor do they like "nicknames". In the English language, no distinction is made between the wife of a younger brother and the wife of an older brother. The wife of your brother is simply your sister-in-law.
what i call my father elder brother's wife
In Hindi, you would call your father's younger brother "chacha."