Probably none as I dont think I know you. If you and I are siblings then my child, if a boy, would be your nephew.
Your nephew as well...
You're a Great Aunt to your nephew's son, who is your great nephew.
Your wife's nephew is your nephew, but the English language has no relationship term for your nephew's wife. Just call her "my nephew's wife."
No, there is no such legal or traditional relationship as nephew-in-law. The term nephew-in-law is not recognized, as it can create confusion due to the lack of clarity in describing the actual relationship.
Neice or nephew no dummy its nephew
Your nephew and your daughter are first cousins.
Your grandfather's great nephew is your second cousin.
You are your nephew's uncle, or aunt, and his son's great uncle, or great aunt. Your nephew's son is your great nephew.
The English language has no relationship name for the wife of your great niece or great nephew.
Your grandfather's great nephew is your second cousin.
Your son's child and your nephew are second cousins.
In English language terms for family relationships, there is no relationship called "nephew once removed." The son of your nephew is your great nephew.