Haylie Duff was born in Houston, Texas. Her mother, Susan Colleen (née Cobb), is a homemaker and film producer, and her father Robert Erhard Duff is a partner in a chain of convenience stores who resides at the family home in Houston to maintain the family's convenience store business. Haylie is two and a half years older than her sister, Hilary Duff, who is relatively more well known than Haylie for her career as a musician and an actress.