Count Nicholas N. Demidoff (9 November 1773 - 22 April 1828 in Florence)
Baronesse Elisabeth Alexandrovna Stroganoff  (1779 - 1818)
 
Son 1: Paul N. Demidoff (6 September 1798 - 25 March 1840) married
Baronne Aurora Stjernwall (Bjornesborg on 7 August 1808 - 13 May 1902 in
Helsinki) 
Son 2: Anatole Demidoff, Prince de San Donato (Moscow 24 March 1813 -30
April 1870 in Paris) married Princesse Mathilde Bonaparte (27 May 1820 -
1904): No Descendants.

(Only Offspring of Paul N.)  Paul Pavlovitch Demidoff, 2nd Prince de San
Donato (Frankfurt-on-Maine on 9 October 1839 - 26 January 1885 in Pratolino near Florence)
1st Wife : Princesse Marie Elimovna Mestcherski (1844 - 8 August 1868 in San Donato)
Son 1: Elim P. Demidoff, 3rd Prince de San Donato (Hietzing near Vienna on 6 August 1868 - 1943): No Descendants.
 
2nd Wife: Princesse Helene Petrovna Troubetzkoii (1853 - 1917)
Son 1: Nikita P. Demidoff, Prince de San Donato (1872 - 1874)
Daughter 1: Aurore Pavlona Demidoff, Princesse de San Donato (2 November
1873 - 16 June 1904); Born in Kiev, Russia; Died in Bussolino Torinese, Italy.  
1st Husband: Prince Arsene Karageorgevitch, Prince of Yugoslavia (Temesvar on 17 April 1859 - 19 October 1938 in Paris)
Son: Prince Paul Karageorgevitch, Prince Regent of Yugoslavia (1893 -1976)
Prince Alexandre Karageorgevitch, Prince of Yugoslavia (1924 - )
2nd Husband: Conte Palatin Nicola Giovanni Maria di Noghera  (15 June 1875 - April 1944); Born in Eboli (province of Salerno, Italy), Died in Treviso.  Married in Genes, Italy on 4 November 1897.
Daughter: Contessa Palatine Helene Aurore Noghera (Turin, Italy on 22 May 1898 - Mato Grosso, Bresil on 12 October 1967)
Husband: Gaston Tissot (Geneva on 12 December 1891 - Geneva on 21 June
1945)
Son: Humbert Jean  Tissot (7 September 1921 - ); Born in Geneva, Switzerland.
Wife: Marguerite Mendes Teske (12 March 1928 - 8 January 1992); Born in Montevideo, Uruguay; Daughter of Paul Mendes (1905 - 1932) and Margarita Teske (1908 - 1988) 
Son:  Alexandre Tissot Demidoff * (4 September 1956 - ); Born in Geneva, Switzerland.  Married 14 June 1986 in Chicago, Illinois, USA.
Wife: Catherine Ann Menne  (14 March 1959 - ); Born in Green Bay, Wisconsin.
Daughter:  Simone Marie Tissot Demidoff (28 October 1987 - ); Born in Chicago, Illinois, USA. 
Son:  Pierre Alexandre Tissot Demidoff (16 August 1990 - ); Born in Chicago, Illinois, USA.

Son 2: Anatole P. Demidoff, Prince of San Donato (San Donato on 12 November 1874 - Marseille 27 October 1943)
Wife: Eugenie C. Podmener, Princesse de San Donato  (1871 - 1958)
Daughters: Helene A. Demidoff, Princesse de San Donato (1901 - 1970)
Eugenie A. Demidoff, Princesse de San Donato (1902 - 1955)
Aurore A. Demidoff, Princesse de San Donato (1909 - 1944)

Daughter 2: Maria P. Demidoff, Princesse of San Donato (Kiev on 3 February 1877 - 25 July 1955 in Pratolino)
Husband: Prince Semen S. Abamelik-Lazarev (1857 - 1916)
Adopted Son: Prince Paul Karageorgevitch, Prince Regent of Yugoslavia
(1893 - 1976)
 
Son 3: Paul P. Demidoff (San Donato on 4 February 1879 - Paris on 30 April 1909) No wife / descendants.
 
Daughter 3: Helene P. Demidoff, Princesse de San Donato (St. Petersburg on 10 June 1884 - Florence on 4 April 1959)
1st Husband: Comte Alexandre P. Schouwalov (Vartemiagui, Russia on 7
September1881 - London 13 August 1935)
Son: Comte Paul A. Schouwalov (Moscow 13 November 1903 - London 25
September 1960)
Son: Comte Alexandre P. Schouwalov (London 4 May 1934 - )
2nd Husband: Nicolas A. Pavlov (Tambov 9 May 1866 - Vanves, France 31
January 1934)
   
Sources:
E.I. Krasnova; Ekaterinburg, Demidoff Institute, 1992
Jacques Ferrand, Les Familles Comtales de L'Ancien Empire de Russie en
emigration
Jacques Ferrand, Les Familles Princieres del L'Ancien Empire de Russie, 1997, 2eme edition

*  Official Representative of the International Demidoff Foundation in Europe since August, 1997.  Assumed ancestral family name, Demidoff, in 1999 in an effort to better promote charitable and cultural work of the DInternational Demidoff Foundation in Europe.