Aunt
Aunty
Auntie
Your mothers sister is your Aunt
The relation of the mother;s sister to daughter is niece-aunts.
Your mother's sister's husband's sister is your aunt's sister-in-law, but is not related to you. Here's why: Your mother's sister is your aunt. The sister of a woman's husband would be her sister-in-law. In this case the woman is your aunt. So your mother's sister's husband's sister would be your aunt's sister-in-law.
She would be the same relation to you as she is to him.
There is 2 answers your mothers brothers children or your dads sister;"s children
They are half brother and sister, they have the same father but different mothers.
the relation is that person is either your half brother or half sister. 1/2 brother or sisiter
Your sister would be her great aunt and she would be your sisters great niece.
If your half-sister had a son that would be a half-nephew to you
you would be her aunt and she would be your niece
The sister's son would be the nephew of her brother.
Should stay sister like otherwise it would be wrong.