your cousin
Your great grandparents brothers and sisters are your great uncles and great aunts.
Your father's uncle's uncle is the son of your great great grandfather. He may be your great grandfather or he may be another brother of your great grandfather, and thus your great great uncle.Your father's uncle also has aunts and uncles from the other side of his family. That is, he has uncles who are brothers of that one of his parents who is not a descendant of your great great grandfather. Those uncles are not related to you at all.
Your fathers brothers are your uncles. You are their nephew, or niece.
your uncles daughter would be your cousin
Your father's father's brother is your great uncle.
Your father's great grandson could be your grandson, or your great nephew.
WHAT relationship* is your Gramps to your great granddaughter? pretty tricky but (distant sisters one off)
Your Great-Uncle is your father's uncle or your mother's uncle. Another way to look at it is to realize that your great uncle is the brother of one of your grandparents.
Athena's father was Zeus so her uncles were Hades and Poseidon.
Your father's brother's son is your first cousin. Your father's brother's grandson is your first cousin, once removed.
She is your father's aunt and your great aunt. You would be her grand niece.