His sister is always going to be his family, so rather than create ultimatums for him, the best thing you can do is to build bridges and focus on what’s good, all the while not making mountains out of molehills. Your boyfriend’s sister is your child’s aunt, and I know you don’t like her, but she is going to have a lifelong relationship with your child, so it’s worth it to work on the relationship. It’s also very normal to not like someone in your husband’s family, or — in your case, your boyfriend’s family. Lots of women don’t get along with mother in laws or sister in laws, so you’re not alone here. 😉 At the end of the day you can only change your own behavior, not your boyfriend’s, and not your boyfriend’s sister’s behavior, either.
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