Would you expose your cheating sister?

I caught my sister cheating on her husband and coincidentally a few days later she asks him to move out. They’re separated for now but still together. The poor guy thinks it’s his own fault and something he’s done. What she doesn’t know is that I have a photo of her and the other man together out in public WITH HER CHILD. She and her husband have a son who is going to be 1 year old this weekend. I’m close with her husband and love him like a brother but I have concerns and my feelings are mixed in what to do about this.

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