Relationship Sequence:
Your uncle is a brother of one of your parents
His son/daughter is your 1st cousin
His grandson/granddaughter is your 1st cousin once removed
His great grandson is your 1st cousin twice removed
Your grandfather's brother's grandson is your great uncle's grandson. The grandchildren of great aunts and great uncles are your second 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.
Your uncle is your child's great uncle and your grandchild's great great uncle. Your grandson is your uncles great great nephew.
The son of your grandson is your great grandson. You are his great grandmother or great grandfather.
Your father's great grandson could be your grandson, or your great nephew.
Your brother is a great great uncle to your great grandson. Your great grandson is your brother's great great nephew.
You Aunt is you grandson's Great-Great Aunt. Your grandson is your Aunt's Great-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 great great aunt is the sister of one of your great grandparents.Her grandson is second cousin to one of your parents, and your second cousin, once removed.
You and your great great aunt's great grandson are third cousins.
George Washington's great great grandson did not go to school. Washington had no children of his own so he had no great great grandson.