Your grandfather's brother is your great uncle
Your grandfathers brother to you is your Great Uncle!
Your grandfather's brother is your great uncle.
You would be second cousins.
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
Your daughter's grandfather's brother's son is her mother's or father's first cousin and her first cousin, once removed.
Your grandfather's brothers would be the uncles of your parent. That would make them your great uncle.
Your grandfather's uncle is your great great uncle. Your grandfather's brother would be your great uncle
Your Grand Uncle(great uncle) would be your grandmother or grandfathers brother.
Your brother to her would be a brother-in-law.
There is none, as there is no actual relationship.
Brother-in-law
Your brother's wife is your sister-in-law. The English language has no relationship term for the brother of your sister-in-law. He is not considered to be related toyou, although he is your brother's brother-in-law.