Woman loved babysitting her niece until she showed up to the family dinner dating the girl's dad — her sister's response made things worse
'She was at my baby shower ... All while secretly wanting my boyfriend.'
Heartbreak is not as dramatic as a betrayal. In the case of a 27-year-old woman (u/infinitenarrative), the betrayal was unleashed during a family dinner. She and her ex had broken up a few months earlier and were co-parenting their 2-year-old daughter. But ever since her sister entered the dining room, arm-in-arm with her ex, she couldn’t help but draw her toddler close and away from them. It wasn’t just the shock of a new relationship that left her in stunned silence, but the entitled behavior that followed from her sister. After learning what had happened, she told her sister she would no longer be comfortable letting her babysit for the time being. Her October 24, 2026, Reddit post has accumulated 2,500 upvotes.
AITA for banning my sister from babysitting my daughter after she got with my ex?
by u/infinitenarrative in AmItheAsshole
Insisted on babysitting her niece
The woman has a 2-year-old daughter with her ex-boyfriend. Ever since they broke up a few months ago, they have been co-parenting her under split custody, according to which he sees her on weekends. Yet she is strictly resistant to her 30-year-old sister babysitting or even seeing her daughter. Although her sister is always keen on babysitting her niece, buying her gifts, and calling her her little best friend, the woman is hesitant to let her play with the toddler. The reason for this goes back to the family dinner they had recently.
Secretly eyed sister's boyfriend
During the family dinner the other day, her sister showed up with her arms slung around her ex-boyfriend. Her sister admitted that she and the ex had had feelings for each other for years. According to the woman, they first hooked up during a month-long breakup, then continued talking behind her back after she and her boyfriend reconciled. “She was at my baby shower, in the delivery room, and held my daughter before I did. All while secretly wanting my boyfriend. Actually insane behavior,” the woman confessed.
Sister's orders
When the woman tried to take her daughter away from her sister, she cried, saying that she didn’t want to lose touch with her niece. Their mother, too, is siding with her sister, insisting that she let her babysit the little girl and accusing her of being jealous. “I said no until I’m comfortable with it,” the woman recalled.
Betrayal can fracture more than one relationship
Betrayal can be particularly painful when it comes from someone a person already trusts. A study by the Journal of Community & Applied Social Psychology, published on August 23, 2023, in Wiley Online Library, analyzing more than 900 betrayal narratives from British, French, and Swiss participants found that 30% of the reported betrayals involved a romantic partner, while 27% involved a close friend. Romantic unfaithfulness was the single most commonly reported form of betrayal, accounting for 17% of the narratives. Other cases involved family members and people in the workplace, and the most common responses were confronting the betrayer or cutting ties.
Fragile trust
The woman stressed that after all these comments, she’s now thinking of no contact from her mother and sister. u/black_eyed_susan commented, “That is a trust that can't be broken. Your sister is deeply in the wrong, and your mom is pulling the classic 'don't stir the pot' mode. How would your daughter feel when she's older? Kids aren't dumb and can put two and two together." u/longjumping-snow-431 said. “I would never trust your sister again! I wouldn’t let her be in the same room as her if I could help it! As for your family, if they in any way are okay with what happened, I wouldn’t trust them with my daughter either.”
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