With sisters there's no room for fibs. You say what's on your mind making them both hate and love you for it. Subsequently, there are things you just can't get away with saying to anyone other than your sister(s):
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1. “Come see the deuce I just dropped!”
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2. “Hey does your boob ever...” or “Hey do your nether regions ever...”
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3. “Mom called, she asked me to ask you to start on dinner.”
Sure she did.
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4. “Ok don’t tell mom, but...”
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5. “You told mom!?”
The betrayal of it all.
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6. “Shut up, I didn’t even hit you that hard... Next time it’ll be the boob.”
7. “No I’m wearing that today! It’s not even yours, it’s ours.”
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8. “You look really ugly. Next outfit.”
The bond is special when it comes to sisters. Nothing is taboo and that's exactly how we like it.