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Of course you should call ahead. Just because you are members of the same national sorority does not mean that proper etiquette is thrown out the window.
I would think that just showing up, even on a random Saturday afternoon, would merit a phone call beforehand. If you are taking the time to plan to visit the house, why wouldn't you take five minutes to see if it's okay with the residents. For a myriad of reasons, it may not be a good time to accomodate visitors or those interested in a tour, even if you are sisters.
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