I would think that would make him your great grandpa!
The father of your grandfather is your great grandfather.
Your father's sister is your Aunt. Your mother's sister is also your Aunt.
Your mother or father's Aunt, however, is your Great-Aunt.
your uncle
"Uncle" is your father's brother.
Your father's brother is your uncle.
Your father's brother's son is your first cousin.
what i call my father elder brother's wife
Your father's brother's son is your first cousin.
Your father's brother is your uncle. His wife is your aunt.
Half-Brother.
Your father's brother is your uncle.
Your uncle.
Your father's brother is your uncle; you are his niece (if you are a girl) or his nephew (if you are a boy).
to you, she is your first cousin. to your father, she is his niece.
what i call my father elder brother's wife