Your great grandfather's brother is your great great uncle.
Your grandfathers brother to you is your Great Uncle!
Your grandfather's brother is your great uncle.
He would be your great great uncle, but you could call him whatever endearing name you both prefer. my great grandfathers brother or my great uncle
She would be your great grandmother
He would be your great-great uncle.
Your grandfather's brothers would be the uncles of your parent. That would make them your great uncle.
Your grandfather's great nephew is your second cousin.
Your grandfather's uncle is your great great uncle. Your grandfather's brother would be your great uncle
My great great second, half, brother in law who's great great grandfathers....son.
Your great grandfather's sister is your great great aunt. You are her great great niece or great great nephew, depending on your sex.
Your brother is a great great uncle to your great grandson. Your great grandson is your brother's great great nephew.
Your Grand Uncle(great uncle) would be your grandmother or grandfathers brother.