Your great great grandmother's sister is your great great grandaunt, some would say great great greataunt.
Your grandmother's sister is your great-aunt.
Yes, your great grandmother's sister is your great-great aunt. Your great aunt is your grandmother's sister.
If your great great grandmothers were sisters, your common ancestors are your great great great grandparents. That makes you 4th cousins.
Marrie Carrie was named after her grandmother and her grandmothers sister (great aunt)
Your great great grandmother's sister's great great grandson is your third cousin, twice removed.
Your sister's son is her grandson and your great nephew. Some use the term "grand nephew."
Your her great great aunt!
Your grandmother's sister is your great aunt.
Your brother-in-law is your brother-in-law because he married your sister and his siblings are are only her in-laws not yours, so his sister is just your brother-in-law's sister. She's not related to you to you. Your brother-in-law can also be the brother of your spouse. In that case, his sister is the sister of your spouse, and your sister-in-law.
Your grandmother's sister's children are your first cousins, once removed.
Your sister's son is her grandson and your great nephew. Some use the term "grand nephew."
Your grandmother's sister is your great aunt. You are her great niece, if you are a girl, or her great nephew, if you are a boy.