"She is your mirror, shining back at you with a world of possibilities. She is your witness, who sees you at your worst and best, and loves you anyway. She is your partner in crime, your midnight companion, someone who knows when you are smiling, even in the dark."
-- Barbara Alpert

1. You'll always have someone to go to for advice

Whenever you have a tough decision or you're facing a dilemma, going to your sister for advice is your best bet. Unlike some friends, she will give you an honest answer. She'll help you figure out what truly is best for you. Even if it's not what you want to hear, she'll be straight forward with you.

2. Endless girls nights

There will be plenty of nights when you have absolutely nothing to do, but stay in. Your sister will be right there beside you pouring the wine and looking for something to watch on Netflix.

3. You can tell each other anything

Your sister has known you longer than most people. You can tell her anything, judge free, and she'll understand and support you . She's the one person you can trust with anything and everything.

4. She'll always have your back

Whether she's backing you up when someone tries to put you down or helping you through a break up, your sister will always be there for you no matter the circumstance.

5. You always had someone to play with when you were little

I truly feel bad for people who are an only child. Growing up with a sister, you always had someone to keep you company. There was days when Mom or Dad would say no when you asked to have friends over, but with a sister, you always have a friend.

6. Sharing

When you have nothing to wear, your sister will.

7. Endless jokes

Having a sister means having tons of inside jokes to always be laughing about with each other.

8. You can't stay mad at each other

You may be fighting with her right now, but in ten minutes you'll completely forget all about it.

9. You make the most amazing memories together

The best memories in life are made with those who mean the most to you. When you have a partner in crime like your sister to go on crazy, spontaneous adventures with, it's almost a definite that life-time lasting memories will be made.

10. She's your best friend for life

She's been by your side through everything, she's your rock, she knows you better than you know yourself, and for that, you love her more than life itself.