Your son's child and your nephew are second cousins.
Your son and your nephew are first cousins to each other. Their daughters are second cousins to each other.
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.
My sister's son is my nephew.
Neice or nephew no dummy its nephew
Your nephew and your daughter are first cousins.
Your grandfather's great nephew is your second cousin.
Your sister's son is your nephew His sons are your grandnephews, and his daughters are your grandnieces.
Your sister's son is your nephew His sons are your grandnephews, and his daughters are your grandnieces.