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.
He would be your brother-in-law
Hopefully by her given name
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 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.
The wife of your brother (younger or older than you) is your sister-in-law.
Your younger brother's wife's sister's daughter would be your son's cousin.
A hoe.
Brother in-law
aunt
Your brother's wife is your sister-in-law.
younger brother's wife -- maradalu elder brother's wife ---vadina
We call "Mami" to moms brother's wife.
sister in law
probably by her name