Tinkybabe: Your mother

Your aunt's husband's sister in law is your aunt's sister.. And since your mother happens to be her only sister.. You were introduced to your mum.

This is wrong.

What if your aunt husband have another sister-inlaw E.g your aunt husband brothers wife.

OP's IQ question is useless.

stanliwise: Let break it down

Your mother's sister = aunty.
Your aunty's husband = uncle.
Your uncle's sister-in-law = Aunty or Mother.
Your uncle's sister by blood = your aunty.

So the answer is your Mother(because she is the only sister)
Note: whether in-law or by blood aunty is aunty!!.

nobody stated that the uncle is an only child.... so therefore, his brother's wife can be his sister Inlaw,his brother's wife's sister can also be his sister inlaw.his sister's husband's sister can even be his sister Inlaw...hehehehe

D person no know im mama again as dem dey introduce am to him.

Word play indeed!! see as op use English scatter my brain dis evening

sister inlaw

davbravo: she is ur mother

Indeed