Stewart's mother was a pianist, and music was an important part of family life. When a customer at the store was unable to pay his bill, Stewart's father accepted an old accordion as payment. Stewart learned to play the instrument with the help of a local barber. His accordion became a fixture offstage during his acting career. A shy child, Stewart spent much of his time after school in the basement working on model airplanes, mechanical drawings, and chemistry—all with a dream of going into aviation. He attended the Wilson Model School for primary school and junior high school. He was not a gifted student and received average to low grades. According to his teachers, this was not from a lack of intelligence, but due to being creative and having a tendency to daydream.