Unfortunately, bullying is way too common in schools. Kids every day are tormented, either physically or emotionally, and it can be really tough on their mental health.

If you're lucky, you have siblings who are more than happy to stand up for you. Sort of a "I can pick on them, but only because we're family!" mentality.

For one Twitter user, @daisybhelm, she witnessed first hand what the love of a sister can accomplish.

Daisy was babysitting for two girls when she came across a hand-written invitation one of the sisters, who's 12 years old, had made. On the front it said "YOU'RE INVITED!" in big letters, but the inside was something much more interesting.

COME ON! How amazing is this?

I can't decide if my favorite part is when she says "bring your nasty attitude and throw in right in the trash can!" or if it's her email, which is ava@kindlyfreakingstop.gmail.com

Actually, it might be when she refers to her "emotional 7th grade wrath."

Wait no. My favorite part is definitely on the back of the card.

On the back of her card, Ava made sure the bullies got her message loud and clear.

She proceeded to write out "STOP" in no less than twenty languages.

That last part reads "Here is the word stop in 20 languages, 'cause English isn't enough 4 you!"

You tell 'em Big Sis!

My guess is that no one messed with Ava OR her sister from that point forward.