Roger Federer tells his own children how they can become professional tennis players Federer, 36, is a father of two sets of twins – daughters Myla and Charlene, who celebrated their eighth birthdays in August, and Leo and Lenny who turned three in May. The 19-time Grand Slam champion is regarded as one of the greatest sportsmen in history. And his kids have some strict instructions if they are to follow their dad into the sporting arena – try hard. Federer said: I want them to enjoy their sports whatever they are doing, and that they try hard, not to just waste time, waste money and waste somebody elses time. If they do it, I want them to do it with passion and Ill support them whatever they want to do, but they dont need to necessarily become tennis players. Federer was then asked what he would have done if he wasnt a tennis player. He replied: I chose between tennis and soccer when I was 12 years old. I always tell the story that if I wasnt a tennis player Id probably be a soccer player, or I would have figured out at school what I would have become but still today I follow soccer very closely. Federer is in action in Glasgow on Tuesday when he takes on Andy Murray in an exhibition match. He then flies into London ahead of the ATP World Tour finals, which start on Sunday.