It's hard to deny that having a sister is one of the best things in the world.

It's like another older or younger version of you but slightly different, but most of the time she's ready to back you up. As much as we fight and squabble with our sisters over the years, she's always there for you at the end of the day and she sure comes in handy if you're having a quarrel with a parent or other sibling.

via Giphy

One sassy sister has given me a serious smile after sending a very serious warning to girls who were bullying her sister. According to Metro, 12-year-old Ava decided enough was enough and tackled her little sister's bullies by the means of a party invitation. Daisy, the babysitter to Ava posted pictures to Twitter of the pretty card which was not all that it seemed. The outside of the card looks perfect, a friendly invitation from one 12-year-old to another. What lies inside though is a far from friendly invite, but rather a threatening message to warn those bullies off. The text in full reads:

"Hey there! You, Elke, Grace, and Ashley, are officially invited to stop being jerks to my sister! "When: Right now!! "Where: Everywhere!! "What to bring: Bring your nasty attitude and throw it right in the trash can! "Why: You guessed it folks, you're being jerks!"

Ava kindly includes an RSVP with an email address of 'Ava@kindlyfreakingstop.gmail.com' and signs the card with a slightly ominous 'hope you can make it! (you better)'. The SASS IS REAL in this child. Ava even (somehow impossibly) went the extra mile and translated 'stop' into several languages, just in case the readers of the card didn't understand English. This 12-year-old WINS. We can't see any bullies hanging around after a serious warning like this...

All images via Twitter