My dad remarried, thus I have a stepmom. She had a son, therefore I have a stepbrother. But that brother just got married, and I don't really know what that makes his wife. I thought stepsister, but that would imply my brother and sister got married. Stupid I know, but it's bugging me - any help is appreciated.

Hmm, first time on this site and this section looks like serious stuff - sorry if I'm in the wrong section or if this topic appears to be making light of your more serious problems.

She's your step-sister in law.
All in all no blood relation at all.

I too agree with step sister in law. I also welcome you and your question, and no question is to small to be asked.

Step sister in law sounds right.

For some reason, AMHD still doesn't allow me to give reputation guys. Sorry.