There is no special name for this relation. If he calls you "uncle", which was the custom in my family for the husband of my aunts, you can describe him as your nephew unless there is some reason to make it clear that he is really your wife's nephew.Well just going to add on if you guys are really close than you guys would have nickname for each other or just use a simple name
By her name. There is no name for the relationship as there is none.
Yes.
The English language has no relationship name for the wife of your great niece or great nephew.
If your sister had a son, then he is your nephew.
Your nephew's child is your great niece (if a girl) or your great nephew (if a boy).
The English language has no special name for a nephew's wife and does not consider you to be related to you. You would simply call her "my nephew's wife."
Your mother's nephew is your First Cousin.
You are your nephew's uncle if you are male, and his aunt if you are female.
Either nephew or nephew in law.
Mother in-law
My sister's son is my nephew.
sweety
Nephew.