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The step sister of your step brother or step sister.
KAREN: This is my side-step-sister, Sherry.

JANE: Side-step-sister?

KAREN: Yes, Sherry is my step sister's step sister.

SHERRY: Hi, Jane. Did you meet Alice?

JANE: Yes.

SHERRY: Well, Karen & I are not genesisters at all. But, Alice is the step sister of BOTH Karen AND I. That's how Karen and I met -- through Alice.

JANE: Okay. I get it. Neat!

by Karen Guiawer July 14, 2006