Reality TV star Jack Osbourne turned down his mother SHARON's offer to run her management company - because he refuses to work with his sister KELLY. Osbourne, who is writing his autobiography, dreams of one day running his own multimedia company like British TV star Simon Cowell. But the 21-year-old son of veteran rocker Ozzy Osbourne rejected his mother's offer of help when he realised he would have to work with pop star Kelly. Osbourne says, "I'd like to run a TV production company and record label all in one. Like Simon Cowell, but not as mean. A few years ago Mum asked me if I would consider running her management company. But I don't think I could manage Kelly."