In California it is only legal with parental permission. Without it you would need a court order.
Great Aunt
Your great aunt.
Your Great Great Aunt
Your mothers sister is your Aunt
your great aunt.
You are their aunt or aunt by marriage.
Aunt Aunty Auntie
Report it. Get the child help immediately. If there is no one else (grandmother, aunt, adult siblings, etc.) to care for the child, he/she will be awarded to the state.
This is simple.... Reach into your mothers vagina.
"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.
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.
Padme Amidala.