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You're just messing around, but you still want to remind them you're sisters, and you're not done arguing yet. You'll still talk, even if it's just to complain.
Hey, I'm kidding, we're sisters, we talk, I still have a grudge about your last birthday gift.
I'm kidding, we're sisters, we talk, I'm not done yelling at you yet.
I'm kidding, we're sisters, we talk, I'll still text you at 2 a. m. about this.