Sydney Mumby was born two months early in Toronto on August 27, 2000 to a paramedic father and former Toyota worker mother, and has a twin sister. She has taken horseback riding lessons for three years at Sherwood Farm, where she rides a horse named Blue, and is involved in robotics, yearbook, and book club at school. Her future career goal is to become a vet, which will require 8 years of university education.