Your great great uncle's great great grandson is your third cousin 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 grandson is your sister's great nephew and she is his great aunt.
Your grandfather's brother's grandson is your great uncle's grandson. The grandchildren of great aunts and great uncles are your second cousins.
The great grandson of your great grandfather's brother is your third cousin
great great nephew and u wud be a great great aunt... i think :)
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.
Great Grand Nephew
Great Uncle.