Heard Tom and Ray pondering this one.
Well, we have a term for it in India - “co-brother”
Brother-in-law once removed?
The guy who tricked my sister-in-law?
“What the heck was she thinking?”
How do I call him?
Most of the time, I just use the telephone.
;-))
I’m a country boy - I yodel.
If she’s your sister in law, wouldn’t her husband be your brother?
Sounds like that old song “I’m my own grandpa” by Lonzo & Oscar.
I will call him by his name… 
Not if she’s your wife’s sister.
On a private cell phone that she has no knowledge of?
That’s only if you’re female…
We don’t really have such a word in English. I think in Mexican Spanish, they do, though it is confusing. Concu?o.
Not sure if we need one in English. We don’t even have a word for second person plural except You-all (y’all).