Sister in law
Your wife's brother is your brother-in-law.
My wifes brother in law!
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?
While generally referred to as a Sister-in-law, there is no relationship.
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.
Mother in-law
Your sister in law is your husband's sister or your brother's wife.
Your grandmother's brother's wife is your great aunt.
You're wife's brother's wife is your sister-in-law.
your father-in-law's house
The relationship of the sibling of your sister-in-law or brother-in-law to you does not have a name in English. You could call them your brother- or sister-in-law if you want, or you can call them the brother or sister of your brother- or sister-in-law.