The Duke of Cambridge (Prince William) is the second in line to the throne and the elder son of The Prince of Wales and Diana, Princess of Wales. His Royal Highness is married to The Duchess of Cambridge, Catherine, with whom he has two children, Prince George and Princess Charlotte. The family's official residence is Kensington Palace, but Their Royal Highnesses also spend part of the year living on the Sandringham Estate in Norfolk. The Duke of Cambridge works as an Air Ambulance Pilot for the East Anglian Air Ambulance, in addition to undertaking a number of charitable activities and projects and carrying out public duties in support of The Queen.