 On 25 July 1902, in Cetinje, Prince Mirko married Natalija Konstantinović (10 October 1882 in Trieste – 21 August 1950 in Paris), daughter of Alexander Konstantinović and wife Milena Opuić, paternal granddaughter of Aleksandar Konstantinović and (m. 1842) Princess Anka Obrenović (1 April 1821 – murdered, 10 June 1868 in Belgrade), daughter of Jevrem Obrenović (1790 – 20 September 1856), younger brother of Miloš Obrenović I, Prince of Serbia, and wife (m. 1816) Tomanija Bogicević (1796 – 13 June 1881).The couple had five sons before divorcing in 1917