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The original was posted on /r/amitheasshole by /u/Sponge_Throwaway9637 on 2024-01-19 01:11:38+00:00.
My (29F) sister Ann (30F) has always been the “golden child” in our family. Our parents always went to her cheer competitions but didn’t care that I was a straight A/B student. After HS Ann met my now-BIL and had my niece (7F).
Ann gives my niece everything she wants. IMO this has turned my niece into a bratty mean girl. She throws a tantrum if she doesn’t get what she wants and they always give in. Ann makes passive aggressive comments about how I don’t have a husband and my niece has started imitating her.
Every year our friend “Joe” hosts a Halloween party. The party is for adults but Ann always wants to bring my niece and do a “family costume”. No one says anything because she is so sensitive. The worst part is she always wants to include me in the costume but picks costumes that make me look bad. I think Ann is jealous that she used to be the pretty one but she gained some weight after having my niece. One year they were Scooby Doo characters and they made me dress up as the miner 49er. You get the idea.
Last September and they were talking about SpongeBob Halloween costumes (niece is a big fan). My niece said “auntie should be Squidward because she is so skinny and grumpy!” They all laughed and agreed that my niece would be SpongeBob, Ann would be Sandy Cheeks, my BIL Patrick and I would be Squidward.
I came up with a plan. I said it was a great idea and acted happy when Ann dropped off my costume. It was this green onesie she sewed and my BIL’s tan polo shirt (he's a big guy so it was v unflattering). Meanwhile her Sandy costume was a skintight white bodysuit and squirrel ears.
Secretly I prepared my own costume. I got a white crop top, brown booty shorts, thigh highs and high heel Mary Janes. I did my makeup to incorporate the SpongeBob color (yellow). As a cheeky joke I drew a heart “tattoo” on my arm and in the heart it said “Spongeboob”.
Well the day arrived and I showed up at the party in my costume. My niece started screaming and crying that I was wearing the same costume as her. Ann screamed I was traumatizing my niece by “stealing her costume”. I said SpongeBob is not her intellectual property so they stormed out.
After they left my costume was a big hit. Lots of people complimented me on how creative and funny it was. I normally don’t dress “sexy” but I admit it felt good!
The next morning I woke up and had missed calls from my parents and our family friend Kevin, yelling how dare I upstage my niece. I calmly explained that Ann needed a taste of her own medicine and my niece needed a reality check so she won’t become a spoiled narcissist.
Things calmed down but Ann still won't talk to me (not that I mind LOL). She’s been posting on Facebook about traitors and Benedict Arnold. Last week she posted a picture of my niece at Disney World on Facebook with the caption “if anyone hurts my sweet baby they can catch these hands”. Her post got a lot of likes and now I’m wondering, AITA?