There is no specific word for the husband of your wife's sister. If you need a phrase, call him your "sister-in-law's husband."
would it be a brother in law? not sure about this one! Is it your husband/wifes daughters brother?
would it be a brother in law? not sure about this one! Is it your husband/wifes daughters brother?
My wifes brother in law!
She is your niece.
sisters in law
She is your sister-in-law.
Your grand daughter's husband is your grandson-in-law.
Your 2nd cousin..
Brother-in-law.
Uncle
Your sister-in-law.