AITA for telling my sister to pick another baby name? https://bit.ly/37gjdUS pic.twitter.com/O4cSfIdcL2
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ESH, easy. Cousins sharing first names is common enough, and honestly doesn't really matter later in life. OP made it clear she's upset by this, the rest is up to her sister to either continue being a jerk or give it up. Grow up, both of you.