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."
Mother's grandson as regards her daughter is either her (daughter's) son or her (daughter's) nephew.
Your niece and nephew.
The grandson of your nephew is your great great nephew, but few people use that relationship as a form of address. Usually they call relatives by name or business title, not by relationship.
Your brother's grandson is your great nephew.
brother
If your sister had a son, then he is your nephew.
Your mothers niece is your first cousin. Your first cousin's child is your first cousin, once removed.
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."
You are your nephew's uncle if you are male, and his aunt if you are female.
Either nephew or nephew in law.
My sister's son is my nephew.
group of mothers
sweety
Nephew.
Nephew