Beyonce Knowles' sister SOLANGE is to take over as the pop superstar's manager once their father Mathew Knowles steps aside in five years time. Solange, who has enjoyed pop success of her own, has revealed she's the heiress to the music mogul's MusicWorld empire, which also includes a record label. The pretty 20-year-old explains, "In five years I'll be answering those calls. I'll be the president and CEO." In the meantime, talented Solange, who has also acted in a string of movies, is busy pitching songs she has written to stars like Reba MCIntyre and Celine Dion.