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Having a sister is pretty much the best thing ever — she's a built-in best friend. My little sister Maddy was born when I was 3 years old, so she's basically been around since I can remember. We laugh together, we bicker with each other, and she knows all my secrets. Even when she drives me insane, I know she will always be there for me through the good times and the bad. Maddy is a best friend for life. Here are 20 reasons why any sister is a BFF for eternity.

You share so many inside jokes.
She'll always give you the best compliments.
You both have to suffer through family events together.
She will "like" every single Facebook post and Instagram picture.
You can do gross or evil things to her and she will forgive you.
You grew up listening to the same music.
You never take her insults to heart.
She always knows what you're about to say.
She will listen to every last detail of your problems.
She always has your back.
You can raid each other's closets.
You can obnoxiously flower each other with sisterly love.
You can lie at home and shove your faces with food together.
She will always call you out when you're lying.
You both get SO excited for each other when something good happens.
You have built-in entertainment at all times.
You guys joke about what the two of you will be like when you grow old.
She's your favorite person to mess with.
She is always there for you when you have a crap day.
She knows your deepest, darkest secrets.
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