Your first cousin's son is your first cousin once removed. The son's wife is not related to you.
1st cousin once removed by marriage is your relation to her, even though she isn't technically a blood relative, which really shouldn't matter, give her a hug and call her cousin.
Ellen Cousins
Why would anyone want to sleep with their cousins wife? Are you perverted or what?
He doesn't have a wife!
Your cousin's wife is not related to you, so her cousins is not related to you unless she has some family connection to you besides being the wife of your cousin.
Your brother's wife's cousins are not related to you and the English language has no special term for that. The same applies to the cousins of a stepbrother's wife.
Theodore and Franklin Roosevelt were distant (fifth) cousins. Franklin's wife, Eleanor Roosevelt , was Theodore's niece .
Barbara Cousins
They are out of synch by a generation. They would be first cousins once removed.
That would probably be your cousin-in-law.
If you are close to your step-brother, or to his wife, you can call her your sister-in-law. If you are not close, you can call her your "step-brother's wife."
No relation...lol
You are second cousins