Imagine this scenario:
- Amy and Brent are sister and brother.
- Clive and Derek are brothers.
- Amy marries Clive.
- Derek is therefore Amy's brother-in-law.
- Brent is also Clive's brother-in-law.
- Derek and Brent are _________?
Are they also brothers-in-law?
Is there a term for this?
If there is no specific term, how could I describe their relationship?