Talk it over with your husband and see how he wants to deal with his dumb sister. It sounds like she is really shady and thinks life is a soap opera. Not really a person you guys need in your life, family or not. This kind of behavior causes people to ruin their own and other's lives and makes them do bad things.
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I don't think she's technically your sister in law. He's just your brother in law and she's his wife.
She would have to be your husband's sister to be your sister in law.
Anyway, I might just leave him an anonymous message of some kind. Of course she'll deny it so it's a difficult situation. It's more up to his brother, your husband to have his back.
I wouldn’t say anything. I wouldn’t want to be the person who destroyed their marriage. She’ll find out herself one day. I wouldn’t say anything.
If you have evidence with a date. Who’s cheating on who? It’s usually best to stay out of that.
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I would sing like a bird. Fuck cheaters, they are lowlifes.
Can you find a way to tell him anonymously?
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