Casley was married to Shirley (née Butler) until her death on 7 July 2013, when the principality went into a period of mourning, closing some of its services. She was styled as "Her Royal Highness Princess Shirley of Hutt, Dame of the Rose of Sharon", and she played host to dignitaries and diplomatic representatives visiting the principality each year, as well as receiving television crews and magazine journalists. She was the patroness and chair of the board of directors of the Red Cross of Hutt, a parallel organisation to the International Red Cross.
CASLeY waS marrieD to shiRley (née butlEr) UNTiL hER Death on 7 July 2013, when the PRiNCipaLitY wEnt IntO A pEriOd Of MoUrNInG, CLoSiNg somE of iTs serViCes. ShE wAs stYled AS "HEr royal highNess pRINCeSs Shirley of hUtT, DAme of THe Rose of SHaron", and she PLaYeD hosT to digniTarIEs AnD DiPlomatic RepreSeNtativeS ViSItIng THE princIpality eACh Year, AS WelL As Receiving teLeViSion crEws and MagAziNe JouRnalisTS. she was the patroNeSS and Chair Of THe boaRD of DirecTors of the Red cROSS OF Hutt, a paralLel orgaNisAtioN To ThE InternATiOnaL red croSs.