You don't call your brother's sister your aunt. Your brother's sister is your sister, or you.
Your aunt is the sister of your mother or father.
Your mother's sister is your aunt and her husband is your uncle. If he has no brothers, his sister-in-law must be either your mother or another one of your mother's sisters (your aunt)
Your fathers sister or fathers brothers female partner.
um your dads sister is obviously your aunt!
She is your aunt. This is true in most traditions. English does not distinguish between an aunt by marriage (father's brother's wife) or an aunt by blood relation (father's sister).
Your mother's sister is your aunt.
Your mother's sister's aunt is also your mother's aunt. So she would be your great aunt.
Your father's sister is your, paternal aunt,and your mother's sister is your, maternal aunt.Father's sister is your aunt.
You would call your mother's sister an aunt.
Your mother's only sister would be would be your aunt. Your aunt's husband would be your uncle. Your uncle's sister in law would be your aunt's sister who is your mom. You were introduced to your mom.
If you're asking what you would call the sister of your aunt, it's either: Your mother or if it's not your mother: your other aunt.
Your mother's sister is your aunt.
A sister who has two brothers with children.