Do you remember those early school performances? After countless rehearsals, the big day arrived when you had to step onto the stage in front of your parents, teachers, and a sea of other families. But the real fear wasn’t about the adults—it was about messing up in front of your classmates. After all, you had to face them every day on the playground, which could be daunting. It was even harder if you had a sibling in the audience, or worse, if they were performing right alongside you!

If you made a mistake, it could haunt you forever, becoming a legendary family story. Siblings, after all, can be more merciless than any parent. Take brother and sister Jadon Cole and Dylan Kate Muller, who took things a step further. When they were little, they bravely performed Hallelujah—together!—in matching outfits, no less. But as soon as they started, big brother Jadon couldn’t help but play the know-it-all, constantly interrupting Dylan during the chorus. There’s no rivalry quite like sibling rivalry! Check out the adorable chaos: