Having a sister means always having a built-in best friend and worst enemy rolled into one. It’s a relationship defined by fierce loyalty, loud arguments over borrowed clothes, whispered secrets at midnight, and an uncanny ability to communicate with just a look. For girls with at least one sister, the bond is complex, hilarious, and oddly comforting—even when it drives you a little nuts. Whether you’re two years apart or practically twins, some experiences are universal. Here are nine truths that only girls with at least one sister will truly understand.
