Britain's Prince Charles (2nd L) greets his father Prince Philip, watched by his wife, Camilla, Duchess of Cornwall (R) and his son Prince Harry (3rd R), during a visit to Prince Harry's Sentebale 'Forget-Me-Not' garden, representing his Sentebale charity, at the Chelsea Flower Show in central London May 20, 2013. The annual show opens to the public on Tuesday. REUTERS/Geoff Pugh/Pool (BRITAIN - Tags: ENTERTAINMENT ENVIRONMENT SOCIETY ROYALS)