14-year-old constantly mocks her 16-year-old sister for being adopted, older sister discovers that they're actually both adopted: 'My parents said don't tell my sister or she'll be devastated'

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AITA for threatening to tell my sister we're both adopted if my parents don't make her treat me better?

via u/BathIcy3064
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Neither of the sisters in this story knew that they were adopted, but the younger one picked up on the fact that her older sister did not look like their mom and dad. She mocked her incessantly for it, but had no idea that she was in the same boat.
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via Getty Images (Unsplash+)

_{The image does not depict the actual subjects of the story. Subjects are models.}
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via u/BathIcy3064
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via u/BathIcy3064
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via Jessica Furtney

_{The image does not depict the actual subjects of the story. Subjects are models.}
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via u/BathIcy3064
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via u/BathIcy3064
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via Nikolas Noonan

_{The image does not depict the actual subjects of the story. Subjects are models.}
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via u/readthethings13579
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via u/Curious-One4595
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via u/BathIcy3064
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via u/Silly_Southerner
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via u/BathIcy3064
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via u/Bluebell2519