The Corrs are a family band from Northern Ireland that in the Nineties were huge in that part of the world. They were the most popular band for several years. The band was made up of four siblings, three sisters and a brother, who had basically planned for this all their lives. Their parents were both professional musicians and the children deliberately learned certain instruments so that they could have a band. It helps, of course, to be very talented, and the sisters are drop dead gorgeous as well.
See this early video, "This Is The Right Time" for a good example: