A great aunt or uncle is a sibling (brother or sister) of one of your grandparents.
Great great aunt/uncle. To your niece, you are the aunt/uncle, to her child you would be the great aunt/uncle. So you would then be the great great aunt/uncle of her child's child (her grandson)
You are a great great Aunt (or Uncle) to the grandson of your Nephew.
Your niece's son is your great nephew. You are his great aunt or great uncle.
She is your Great Aunt or your Grandmother.Breaking it down, your father's uncle is your great uncle. Your great uncle's brother is also your great uncle (or your grandfather), and his sister is your great Aunt (or grandmother).
To your uncle, you are his niece or nephew.
She is your Great Aunt in law!
She is your Great Aunt or your Grandmother.Breaking it down, your father's uncle is your great uncle. Your great uncle's brother is also your great uncle (or your grandfather), and his sister is your great Aunt (or grandmother).
You would be his Great Uncle or Great Aunt He in turn would be your Great Nephew.
grandparentGreat Aunt or Great Uncle
You are her great-aunt/uncle. She is your great-niece.
Your aunt's great uncle is also your parent's great uncle. So 2Great Uncle would be one way of naming them.
Well, here's the correlation you should follow: Your great uncle's wife = your great aunt, by marriage Your great aunt's sister = your great aunt, by marriage (think, your aunt's sister is also your aunt, just like your aunt's brother would also be your uncle!) Great aunt's grandson = distant cousin (think, your aunt's child is a cousin.)