Morissette was born June 1, 1974, in Ottawa, Ontario, Canada, to teacher Georgia Mary Ann (née Feuerstein) and high-school principal and French teacher Alan Richard Morissette. She has two siblings: older brother Chad is a business entrepreneur, and twin brother (12 minutes older) Wade is a musician. Her father is of French and Irish descent and her mother has Hungarian ancestry. Her parents were teachers in a military school and due to their work often had to move. From 1977 to 1980 Morissette spent three years of her childhood in Lahr, Germany. When she was six years old, she returned to Ottawa and started to play the piano. In 1981, at age seven, she began dance lessons. Morissette had a Catholic upbringing. She attended Holy Family Catholic School for elementary school and Immaculata High School for Grades 7 and 8 before completing the rest of her high school at Glebe Collegiate Institute (Ottawa). She appeared on the children's television show You Can't Do That on Television for five episodes when she was in junior high school.