“Mia” says she recently discovered that her sister, “Brianna”, is dating her ex, “Jake”, in a Reddit post by u/infinitenarrative. The situation reportedly came to light during a family dinner when Brianna arrived with Jake. Brianna allegedly gave a speech suggesting that people should stop being jealous when others find happiness. Mia asked about the problem, and Brianna reportedly admitted they have had feelings for each other for years. According to the post, Jake and Brianna hooked up during a month when Mia and Jake were broken up. They apparently continued talking behind her back after Mia and Jake reconciled. This history is painful for Mia, as Brianna was apparently present at the baby shower and even in the delivery room. Brianna reportedly held Mia’s daughter before Mia did. Mia feels this behavior is actually insane, and she appears to have no plans to brush it aside. Her own mom apparently thinks she’s just jealous Mia and Jake share a two-year-old daughter, and they reportedly broke up for good a few months ago. The pair have apparently co-parenting fine, with Jake on split custody and seeing their daughter on the weekends. Mia made it clear that this issue is strictly about her sister and does not stop Jake from seeing their daughter. AITA for banning my sister from babysitting my daughter after she got with my ex? byu/infinitenarrative inAmItheAsshole When Mia confronted her sister, Brianna reportedly cried and claimed she did not want to lose her niece. However, Mia’s mother has taken a different approach. She allegedly told Mia that she should get over it, as Mia and Jake were technically broken up when Brianna and Jake first hooked up. The mother also reportedly accused Mia of using her child to punish her sister, claiming Mia is jealous. According to Mia, Brianna and Jake are now officially together. Despite that history, Brianna apparently still expects to babysit Mia’s daughter as if nothing happened. Mia said no to this arrangement until she is comfortable with it, as Brianna had been heavily involved in her daughter’s life. Brianna reportedly babysat often, bought gifts, and even called the child her little best friend. Mia claims she trusted her sister during that time and never suspected Brianna secretly wanted her boyfriend. As Mia concluded the post, she questioned, “Is my family actually insane?” or whether she was TA. Commenters have largely sided with Mia, with one writing, “NTA. your family is in fact insane. i’m so sorry you’re dealing with this.” However, several users focused on the mother, with one suggesting Mia consider going low contact with both her mom and sister. Another argued the mother seems stuck in a “don’t stir the pot” mode. Jake is expected to keep his weekend custody schedule with their daughter, while Brianna’s babysitting role appears to be on hold until Mia says she is comfortable allowing it.