Your brother's wife is your sister-in-law. Your spouse's sister is also called your sister-in-law. Your sibling's husband is your brother-in-law; your spouse's brother is also called your brother-in-law.
Your father's brother's son is your first cousin. The English language does not have a name for the wife of a cousin. You would simply refer to her as "my cousin's wife."
brother in law
Your wife's brother is your brother-in-law.
Your half-brother...
Yes
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?
In the English language, your sister's husband is called your brother-in-law.
Your grandmother's brother's wife is your great aunt.
The English language does not use the phrase "cousin brother." The brother of your cousin is also your cousin.
The English language has no term to describe the brother-in-law of your brother-in-law. He is not considered to be related to you.