If your aunt is your father's sister, her sister-in-law is your mother.

Or just say she,s Uncle sister then she,s Aunt in Law.

mothers are more important.

If she,s you Uncle by marriage sister and then shes realted to you by marriage and she,s Aunt in law or some people say distant Aunt.

But if you ever reference her or introducing her to someone you just say she,s my Auntie.

Benny S. Tabalujan has written:

'Indonesian banking law' -- subject(s): Banking law

'Singapore business law' -- subject(s): Commercial law, Business law