AITA for telling my sister-in-law that she is no longer welcome in our home after what she did?

AITA for telling my sister-in-law that she is no longer welcome in our home after what she did?

I (34F) have been married to my husband, Mark (36M), for five years. We have a 2-year-old son, Ben, and another baby on the way. My sister-in-law, Emma (30F), has always been a bit of a wildcard. She's Mark’s younger sister, and they've always had a complicated relationship. She can be charming and fun, but she also has a habit of causing drama and stirring the pot.

From the beginning, Emma never seemed to like me. She would make passive-aggressive comments about my cooking, my job, even my parenting choices. Mark would tell me to let it go because "that's just how Emma is." I tried to be the bigger person for years, letting her snide remarks slide to keep the peace.

A couple of months ago, Emma started visiting us more often, claiming she wanted to spend time with Ben. I was hesitant but thought maybe she was trying to build a better relationship, so I agreed. One day, she came over while Mark was at work. I was in the kitchen preparing lunch, and Ben was playing in the living room. I heard Emma say something to Ben, but I didn't catch it all. When I went to check, I found her showing Ben how to use her phone. I didn't think much of it until she left.

That night, I noticed Ben was unusually upset and clingy. After some coaxing, he managed to say, "Auntie said I can’t love you." My heart sank. I asked him what he meant, and he said that Emma told him "Mommy doesn't love you, only Auntie does." I was furious. I immediately called Mark, who was equally shocked and angry.

We confronted Emma together the next day. She denied everything at first, but when we pressed, she admitted that she was just "playing a game" and didn't think it was a big deal. I lost it. I told her that she was no longer welcome in our home and that I wouldn’t allow her to come near Ben again. She called me a controlling bitch and left.

Now, Mark’s family is divided. His parents think I overreacted and that I should forgive Emma because "she didn’t mean any harm" and "she's just immature." They keep pressuring us to let Emma back into our lives, saying that I'm being too harsh and that Ben needs to know his family. Mark is torn because he’s always tried to keep the peace with his sister, but he supports my decision.

I feel guilty because I know how important family is, but I can't forgive someone for trying to turn my own child against me. AITA for telling my sister-in-law she’s no longer welcome and keeping her away from our son?

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