Peter Phillips and Harriet Sperling are about to have the royal wedding of the year as they’re due to marry at All Saints Church, Kemble, Cirencester. Although the pair haven’t yet confirmed who their maids of honour or flower girls will be, an obvious choice would be their three daughters from their previous relationships. Peter is a dad to teenagers Savannah, 15, and Isla, 14, whom he shares with ex-wife Autumn Kelly. Meanwhile, Harriet is a mum to Georgina, 13, sharing the teenager with her ex-husband, Antonio St John Sperling. Peter’s two daughters make rare public appearances, normally during only special sporting events, while Georgina remained entirely out of the public eye before her mother started dating a royal. Here’s all you need to know about Peter and Harriet’s daughters… Savannah Phillips Savannah was born on 29 December 2010, and is the late Queen’s eldest great-grandchild, much like how her father was Queen Elizabeth’s eldest grandchild. She is currently 20th in line to the throne. However, in an unusual move, Savannah’s name wasn’t initially given, …