Your great great uncle's grandson is your second cousin, once removed.
Using the males as an example for simplicity, and working backwards from you:
your great great uncle's son was your grandfather's first cousin.
your great great uncle's grandson is your father's second cousin.
These two men are second cousins because it is two generations from the men who shared a common parent. And since you are one generation removed from this second-cousin relationship, you and your great great uncle's grandson are second cousins, once removed.
Your father's great grandson could be your grandson, or your great nephew.
You grandson is great great nephew to your uncle. You uncle is great great uncle to your grandson
You grandson is great great nephew to your uncle. You uncle is great great uncle to your grandson
Your grandfather's brother's grandson is your great uncle's grandson. The grandchildren of great aunts and great uncles are your second cousins.
Your grandson is your sister's great nephew and she is his great aunt.
great great nephew and u wud be a great great aunt... i think :)
The great grandson of your great grandfather's brother is your third cousin
Your grandson and your great nephew are second cousins to each other.
The great grandson of your sister is your great great nephew. You are his great great aunt or great great uncle.
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.
Your great great uncle's great great grandson is your third cousin once removed.
Great Grand Nephew