Your sister's son is her grandson and your great nephew. Some use the term "grand nephew."
Your nephew's first cousin may or may not be related to you, depending on how the cousin is related to your nephew. Your nephew's cousin may be your child, or the child of one of your brothers or sisters. Your nephew is related to you by being the son of your sibling. That sibling has a spouse who may also have borthers and sisters. The children of any of those brothers and sisters are also your nephew's first cousins, but are not related to you.
There is no word in the English language for a relationship between grandmothers of related grandchildren
Your nephew's son isyour great nephew. You are his great aunt or great uncle.
Your grandchildren and your nephew are related t each other as first cousins, once removed.
The nephew of a wife and the nephew of her husband are not considered to be related to each other. However, both are nephews of the wife and the husband, and the wife and husband are aunt and uncle to both nephews.
Your grandson and your nephew are first cousins, once removed.
If your great great grandmothers were sisters, your common ancestors are your great great great grandparents. That makes you 4th cousins.
not to be complicated , but if you have an uncle--> he has a nephew--> as you can see that's not complicated . And if you ask what is a uncles NEPHEW related to an uncles grandfather. in what way ....i would say the nephew is is the great gandfathers great grandson.
NO
No
Your grandfather's nephew is your parent's first cousin. Your grandfather's nephew's daughter is your second cousin.