Call him whatever his name is.
If your uncle is the brother of one of your parents, then his wife's sister and her son are not related to you.
If your uncle is the husband of one of your parents' sisters, then his wife's sister may be:
The English language has no term for such a distant relationship as "your sister's husband's brother's wife."
Your sister's husband is your brother-in-law. His brother is your sister's brother-in-law. But your sister's brother-in-law is not related to you and neither is his wife.
Your father's sister is your aunt and her husband is your uncle.
You would call them your brother or sister inlaw as they are your wife/husbands sibling.
In the english language, he may be reffered to as uncle, or even uncle-in-law.
There is no special name. Your father's brother's wife's brother is your uncle's brother-in-law.
Cousin
Your uncle would be your sons great uncle. Normally your Son would also call him 'Uncle .... '
Your cousin in law
nephew
Your cousin.
nephew!
We would infact, cll our sisters son your nephew and they would call you either auntie or uncle depending on your sex.
Our cousins are our mothers sisters son :)
My sister's son is my nephew.
My sister's son is my nephew.
If your sister had a son, then he is your nephew.
Yes. Any son or daughter of Zeus would be her half-sibling. Any son or daughter of Poseidon or Hades would be her cousin as Poseidon and Hades are her uncles.
Your uncle's son is your first cousin.