Your aunt is the sister of your mother or father, so her mother is your grandmother.
On the other hand, your aunt may also be the wife of the brother of your mother or father. Then her mother is not related to you.
Your Great-Aunt.
You are their aunt or aunt by marriage.
"Relationship to you" means who are they to you, or how do they fit in to your family circle. be they your paternal aunt,(fathers sister) maternal aunt (mothers sister) maternal grandmother (mothers mother) paternal grandfather (fathers father). and so forth.
"Relationship to you" means who are they to you, or how do they fit in to your family circle. be they your paternal aunt,(fathers sister) maternal aunt (mothers sister) maternal grandmother (mothers mother) paternal grandfather (fathers father). and so forth.
Great Aunt
Your mother's aunt's son is her first cousin and your first cousin, once removed.
Your great aunt.
Your Great Great Aunt
Your mothers sister is your Aunt
His relationship to you is brother-in-law.
your great aunt.
a nephew's kid to his aunt's kids would be their cousin.
She would be your great aunt.