Tweets and sweets for Andy Murray's mum as she jokingly flirts with BBC Radio 5 presenter Judy Murray has sat with Radio 5"s George Riley for Andy's last matches They were seen giggling, whispering and sharing a bag of sweets Have also been exchanging jokey Twitter messages online It has caused amusement among Riley's colleagues, who have speculated about their relationship Andy Murray's mother has been bringing laughter to the BBC commentary box by light-heartedly flirting with a presenter. For her son's last two matches, Judy Murray, 53, has sat with Radio 5 Live's George Riley, most recently in the players" box on Centre Court. They were seen giggling, whispering and sharing a bag of sweets. And they have also been exchanging jokey Twitter messages. Judy Murray the mother of Andy Murray of Great Britain, shares a packet of sweets with Radio 5 Live¿s George Riley The pair are simply friends but it has caused amusement among Riley's colleagues, who have mischievously speculated about their relationship. At 34, Riley is nearly 20 years divorcee Judy's junior. On Friday, in Andy's first set against Tommy Robredo, commentator Jonathan Overend said George was "taking up his now accustomed seat alongside Judy Murray," before adding: "The relationship blossoms." Former US star Tracy Austin chipped in: "What's that about?" and Overend replied: "A relationship that began on Twitter and is flourishing by all accounts." Amid giggling, Tim Henman added: "Purely a business relationship."