Your husband's brother is your brother-in-law.
He is your brother-in-law.
You can call your husband's elder brother as "Anna" in Tamil.
The daughter of your husband's brother is your niece.
Your husband's brother, senior or otherwise, is your brother-in-law.
Brother in-law.
My wifes brother in law!
You would call your husband's younger brother a brother-in-law.
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you call him your brother in law
You would call your sister's husband your brother-in-law.
Your Brother in law's wife
brother in law or their name
The daughter of your husband's brother is his (and your) niece. Her daughter is his (and your) great niece.