Your husband's brother is your brother-in-law. Your brother-in-law's wife is not related to you, but is your husband's sister-in-law. The sister of your husband's sister-in-law is not related to you or to your husband.
Mom
you call her your daughter's husband's sister
Your brother would call your husbands sister by her first name. Or, "my (sibling's) sister in law.
i believe that your brother's wife's sister is also your sister in law No, I think not! But as you seem to have the hots for your brother's wife's sister, you can call her "honey" if you like.
I would say aunt in law. If I'm reading this right, you were introduced to your mother.
Its would be your neice
brother in law
Your sister in law is your husband's sister or your brother's wife.
Sister-in-Law
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."
My wifes brother in law!
While generally referred to as a Sister-in-law, there is no relationship.