Hi, Dianne: I'd have done the same thing if anyone in my company acted in the manner your sister did. Domestic strife really ought to be kept private regardless of the triggers which bring it about. But, what's done is done. Have you managed to contact your sister since? Perhaps, if you made the first move to reach out then you'd be in a better position to know how she has been since NYC without mentioning anything about the awkward situation that took place. Just say hello and as it is nearly Christmas, there would be other things to talk about. A good time as any for a phone call or an e-mail.
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