You will defend each other without knowing what exactly you’re defending.

You will stick up for your sister before you even know what she has done.

And tbh, even if you find out she's in the wrong, you will defend her.

Twitter: @ColleenB123

And as soon as your sister tells you she hates someone, you automatically hate them too.

Even if your sister grows up and forgets why they ever fell out, you'll remember.

Disney Channel

You have endless in-jokes that you don't remember the origins of.

If someone else heard you speaking, they wouldn't understand a word of it.

MTV

And there are some words that send the two of you into fits of hysterics.

You can't remember why, but you find certain words and phrases unthinkably funny.

MTV

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