Drolefille - Thanks for your answer
I can only assume if step sisters count, that half sisters would as well.
JennyJ87 - I should have clarified. I think of my half-sisters as my sisters and of course love them just as much. I of course had to clarify to ask this question though. And the thread you provided is has information for a few sororities. Thanks
Is there anywhere else I can go with this question?