Born Audrey Kathleen Ruston[1] on Keienveldstraat (Dutch) / Rue Keyenveld (French) in Elsene / Ixelles, a municipality in Brussels, Belgium, she was the only child of the Englishman Joseph Victor Anthony Ruston[2] and his second wife, the former Baroness Ella van Heemstra, a Dutch aristocrat, who was a daughter of a former governor of Dutch Guiana.[2]
Her father later prepended the surname of his maternal grandmother, Kathleen Hepburn, to the family's and her surname became Hepburn-Ruston.[2]
She had two half-brothers, Jonkheer Arnoud Robert Alexander "Alex" Quarles van Ufford and Jonkheer Ian Edgar Bruce Quarles van Ufford, by her mother's first marriage to a Dutch nobleman, Jonkheer Hendrik Gustaaf Adolf Quarles van Ufford.[2]
She was a descendant of King Edward III of England[3] and Mary Queen of Scots' consort, James Hepburn, 4th Earl of Bothwell,[2] from whom Katharine Hepburn may have also descended.[4] This also made her related to the other notable distant cousins including Humphrey Bogart and Prince Rainier III of Monaco.
Source Wikipedia Audrey Hepburn