We can think of quite a number of reasons why Kate and Pippa Middleton are sister goals. Take, for example, their undeniable brand of chic, from the Duchess’ consistent elegance to Pippa’s down-to-earth charm. But outside of the fashion realm, these two have an enviable bond and fierce family loyalty. Both became students at the Downe House School, and despite splitting up for university, the siblings reunited at family business Party Pieces following their graduation. They were also fully present at each other’s weddings, with Pippa serving as maid of honor for Kate and—although she didn’t hold an MOH or bridesmaid title—Kate adjusting the train on Pippa’s gown as she made her way down the aisle. Here, a trip down memory lane for the Duchess of Cambridge and her equally regal sister.