The twins, Cassiopeia "Cassie" Rose and Sirius "Leo" were born two years after their sister. Hermione’s pregnancy with the twins was stressful and riddled with complications. For the final three months, she was on strict bedrest and had to momentarily recruit Pansy to help at the bookstore which was an unmitigated disaster. So, when both children entered the world with platinum blonde hair, the trio had decided that their family was complete. Like her favorite cousin, Dora, Cassie was a metamorphmagus and desperately wanted to attend Hogwarts with her older sister while Leo was content to stay behind if it meant spending more time at the bookstore with his mum.