Eilleen Regina Edwards was born in Windsor, Ontario, Canada. She had a difficult childhood marked by poverty and, at times, hunger. When she was 2 her parents divorced and her mother Sharon married Jerry Twain, who adopted Eilleen and her sisters. This event marked the start of what would become the Twain family, and Jerry became a supportive father figure, helping nurture Eilleen's burgeoning musical talent.

From a young age, Shania showed a natural aptitude for music. She began singing in local bars and clubs as a child to help support her family, often performing late into the night. Jerry Twain, her adoptive father, recognized her talent and made sacrifices to provide her with opportunities, including guitar lessons and performance gigs. These early experiences honed her performance skills and instilled a strong work ethic.