Currently fourth in the line of succession to the defunct Yugoslavian throne, he is also in the line of succession to the British throne as a great-grandson of Princess Marie of Edinburgh, herself a granddaughter of Victoria of the United Kingdom. Prince Nikolas was born in London to Prince Tomislav of Yugoslavia, second son of Alexander I, the first king of Yugoslavia, and Princess Margarita of Baden.
Through his mother he is a great-grandson of Princess Alice of Battenberg, great-granddaughter of Victoria, and through his father he is a great-grandson of Princess Marie of Edinburgh, Victoria"s granddaughter. He has one sister, Princess Katarina of Yugoslavia and Serbia, and two half-brothers, Prince George and Prince Michael. He is a first cousin of Alexander, Crown Prince of Yugoslavia.
A religious ceremony was performed in Düsseldorf-Lichtenbroich, Germany on 22 November 1992.
Their only child is Princess Marija of Yugoslavia, born 31 August 1993 in Belgrade.
