Woman says her new brother-in-law started flirting with her at a family dinner — and the truth turned out to be even worse once her sister admitted the whole thing was a “test” to see if she’d steal another husband

A woman on Reddit said the whole mess started at one of her family’s monthly dinners. Her sister had only been married about three or four months, and during the meal the new husband started acting bizarrely toward her — complimenting her body, ignoring his own wife, and talking to her in a way that felt so inappropriate she left early because she felt sick and unsettled. She texted her sister afterward to say the behavior made her uncomfortable and offered to address it directly with him if her sister did not want to be in the middle.

The next day, instead of apologizing for her husband, the sister asked to meet up and dropped the real explanation: it had all been a test. She admitted she had told her husband to behave that way on purpose because she wanted to see how her sister would react “if he had meant it.” According to the woman, the sister said that the decision to text her afterward proved she could be trusted around him. The woman wrote that she was stunned and offended, because she had never given her sister any reason to think she would go after her husband.

Then the sister explained why she thought she needed to run the test at all. Years earlier, she had been married before, and that marriage ended in a nightmare. The woman said she had introduced her sister to that first husband, and during the marriage she lived with them because it was closer to work. While living there, her underwear kept disappearing. She originally assumed it was getting mixed into laundry by mistake, but eventually the truth came out: the first brother-in-law had been stealing her bras and panties. Worse, he admitted he had never really loved the sister and had only used the marriage to get close to her. The woman said she was so disgusted that she pressed charges and got a restraining order, and her sister divorced him almost immediately.

But instead of blaming the man who actually caused that trauma, the sister turned the whole thing back on her. The woman wrote that her sister said this history proved she had to be “careful,” and that she believed the woman must have somehow encouraged the first husband or “strung him along” for him to act that way. In other words, the sister used the aftermath of one man’s creepy behavior to justify testing whether her own sister would seduce another husband. The woman said that hurt more than the original stunt itself, because it meant her sister really did see her as a threat rather than another victim.

She reacted by telling her sister not to contact her again if that was truly how she saw her. For the most part, the wider family agreed the sister’s behavior was out of line — except for their mother, who defended the test and claimed the sister was just trying to protect herself from being hurt again. The woman wrote that she told her mother there was a right way and a wrong way to handle fear and insecurity, and this was not only wrong, but completely unhinged. Still, she was trying to cool off and believed she might apologize for her own harsh reaction once some time had passed.

Then the family made it worse. The woman said her mother promised her sister would not attend the next monthly family dinner, so she agreed to come. When she arrived, both the sister and the new husband were already there. She immediately felt ambushed, and that suspicion proved right. The sister demanded an apology and said the entire situation was her own fault in the first place. At that point, the woman snapped and told her she should remove both her number and the title of “sister” from her life.

Not long after that first explosion, she posted an update saying she had decided to step back and stop chasing a reconciliation that would only keep hurting her. She said her brother did not support what happened but was trying to keep his head down while still living at home. Her father was furious with the new husband and did not want him around anymore. The woman wrote that strangers online helped her see how toxic the dynamic really was, and she said that if not for that, she probably would have caved and apologized just to keep the peace, even though she had done nothing wrong.

For a while, things calmed down a little. About nine months later, she returned with a softer update and said she was speaking to her mother again because the mother had apologized. She still was not speaking to her sister, who remained married to the man from the test. She also said she was doing much better personally: she had gotten closer to her father and brother, and her relationship with her boyfriend was going so well that she suspected a proposal might be coming. She even described his family as loving and supportive in the way her own no longer felt.

Then came the final betrayal. In the last update, the woman said she found out her mother had gone behind her back and confirmed her sister’s twisted version of events to extended family. In her words, her mother helped create the impression that she was the kind of person who would seduce her own brothers-in-law and had allowed lies about her to spread. She called her mother, told her she was done, and then wrote a letter to her sister laying out four things: she was sorry for what her sister had suffered, her sister needed serious help for what the first husband had done, she had completely lost the right to call herself her sister after lying to everyone, and the woman never wanted to see or hear from her again. She also decided there would be no reconciliation with either her mother or her sister.

By the end, she said she and her fiancé had decided to skip a big wedding entirely and just do a town hall ceremony with a couple of witnesses. The tone of that last update was sad, but also final. What began as one disgusting family dinner and one creepy fake flirtation ended with her realizing that the bigger problem was not only a manipulative new brother-in-law or a traumatized sister. It was a family willing to recast her as the villain rather than admit how badly she had been wronged — twice.

Original Reddit post.