I'm glad to hear everything has worked out so well! It sounds like your sister has come around.
I think it would be safe to let us know.... after all, you haven't said anything terrible and I can't see why revealing your group would be damaging. You asked for honest advice in a classy way. (I'm a member of a non-NPC and I was not offended by anything you said.) However, if you feel like revealing it would somehow prevent you from being initiated, I guess you are better safe than sorry....