The Bourke family has been in Mayo since the thirteenth century . Her father was Dr. Aubrey Bourke of Ballina , County Mayo , while her mother was an Ulsterwoman , Dr. Tessa Bourke ( nÃ e O'Donnell ) of Carndonagh , Inishowen , County Donegal . The Hiberno-Norman Bourkes have been in Mayo since the thirteenth century .