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.
You don't call your brother's sister your aunt. Your brother's sister is your sister, or you. Your aunt is the sister of your mother or father.
what i call my father elder brother's wife
The word for brother in Tamil is "சகோதரன்" (sakodharan).
You can call your husband's elder brother as "Anna" in Tamil.
I will call her niece.
Your brother's wife is your sister-in-law.
brother in law or their name
your uncle
In Malayalam, elder brother is called "ചേട്ടന്" (chettan).
what i call my father elder brother's wife
what i call my father elder brother's wife
Your brother's wife is your sister-in-law, but she is your children's aunt.