They had four children, Boris III (1894–1943), Kyril (1895–1945), Eudoxia (1898–1985), Nadejda (1899–1958) and Maria Luisa died in 1899. On 28 February 1908 in Coburg Ferdinand married his second wife, Eleonore Caroline Gasparine Louise, Princess Reuss-Köstritz (1860-1917), daughter of Heinrich IV Reuss von Köstritz (1821–1894) and née Luise Caroline Reuss zu Greiz (1822–1875).