Phi Sig we have Sapphire Sisters, which are really "big/Lil" but eliminates one being "above" I suppose. We never switch (and I know some pairings haven't worked out too well, and it is sad for those people who aren't close with their "sapphire, diamond, Key, Big whatever you call her, sister, but hey we all are sisters and there has to be someone you are close to. I say as long as your big and you get along during your new member period that's the most important, but after that if you are not super close, that's kinda sad but there's no reason to "switch". I think that's crazy.
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