Your nephew's daughter is your great niece and you are her great Aunt (or Great Uncle).
Correction:Your nephew's daughter is your grand niece. You are her grand aunt or grand uncle.Your daughter's nephew by marriage is the child of your son-in-law's sibling, there is no direct relation.
Your child and your great nephew's parents would be first cousins. Their children would then be second cousins. And if they have children, they will be third cousins.
She would be his Great Aunt
Your grandfather's brother is your great uncle (some would say your grand uncle). You are his great niece (if you are a girl) or his great nephew (if you are a boy).
You would be his Great Uncle or Great Aunt He in turn would be your Great Nephew.
Your nephew's wife is your Niece-in-Law, whether she is caring for a child from a previous marriage or not. Few people would care to be that precise, however, so most will probably just call her your Niece.
your second nephew
He would be a nephew, unless of course he is a son from a previous marriage, then he would be no relation.
A nephew is a cousin to his aunt's son.
your nephew would be the stepfather or boyfriend of your friends mother
If your niece's is by your sister but the brother is by your sisters new husband & another woman there would be no blood relation. If not then he's the nephew
You would be his Great Uncle and he would be your Great Nephew.
Your child and your nephew are first cousins. Your child and your great nephew are first cousins, once removed.
Umm, well they would just be related ?
If your half-sister had a son that would be a half-nephew to you
You would be a great uncle, so they would be your great nephew
Your son and your nephew are first cousins to each other. Their daughters are second cousins to each other.
Your nephew's fatehr is either your brother or your brother-in-law.