Big and Little Sisters are a deep-rooted tradition at Stoneleigh-Burnham School. Each new student is assigned a “Big Sister," a veteran student who provides friendship and guidance. Big Sisters are mentors, advising their little sisters on which courses to take, which sports to play, and how to navigate life at school. Big Sisters take their Little Sisters to breakfast on Mountain Day and at 100 Nights, Little Sisters recognize their Big Sisters as soon to graduate members of the senior class.