He's your brother-in-law.
You are not related as you do not share a common ancestor.
Probably your niece-in-law.
No relation
Your wife's brother is your brother-in-law.
The wife of your first cousin is not related to you.
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?
Brother-in-law
brother