Prince Jerzy Mikolaj Radziwill, XIX Ordynat Nieswiez1 
Prince Jerzy Mikolaj Radziwill, XIX Ordynat Nieswiez also went by the nick-name of George.1
Child of Prince Jerzy Mikolaj Radziwill, XIX Ordynat Nieswiez and Elaine Chalandon
- Princess Diana Radziwill+ b. 30 May 1953
Child of Prince Jerzy Mikolaj Radziwill, XIX Ordynat Nieswiez and Albina Patricia Bernabei
- Princess Alexandra Radziwill+1 b. 1 Sep 1970
- [S1882] George Radziwill, “re: Radziwill Family,” e-mail message to BENR, 29 August 2006. Hereinafter cited as “re: Radziwill Family.”
- [S6572] Patricia Radziwill, “re: Radziwill Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 23 February 2013. Hereinafter cited as “re: Radziwill Family.”
Elaine Chalandon
From 10 June 1952, her married name became Radziwill.
Child of Elaine Chalandon and Prince Jerzy Mikolaj Radziwill, XIX Ordynat Nieswiez
- Princess Diana Radziwill+ b. 30 May 1953
Princess Diana Radziwill
From 1 June 1974, her married name became Carabba Tettamanti.1
Children of Princess Diana Radziwill and Nobile Ferdinando Carabba Tettamanti
- Nobile Alessio Carabba Tettamanti1 b. 23 Sep 1975
- Nobile Massimiliano Carabba Tettamanti1 b. 7 Jan 1978
Princess Roza Radziwill 
Her married name became Swiatopelk-Czetwertynski.
Children of Princess Roza Radziwill and Prince Ludwik Swiatopelk-Czetwertynski
- Prince Jerzy Swiatopelk-Czetwertynski+ b. 19 Feb 1907
- Prince Stanislaw Swiatopelk-Czetwertynski+ b. 7 Mar 1910
- Prince Andrew Swiatopelk-Czetwertynski b. 16 Sep 1911, d. c 20 Sep 1939
- Princess Roza Swiatopelk-Czetwertynski+ b. 1 Apr 1914, d. May 1990
- Princess Marie Elizabeth Swiatopelk-Czetwertynski+ b. 21 Mar 1920
Prince Ludwik Swiatopelk-Czetwertynski 
Children of Prince Ludwik Swiatopelk-Czetwertynski and Princess Roza Radziwill
- Prince Jerzy Swiatopelk-Czetwertynski+ b. 19 Feb 1907
- Prince Stanislaw Swiatopelk-Czetwertynski+ b. 7 Mar 1910
- Prince Andrew Swiatopelk-Czetwertynski b. 16 Sep 1911, d. c 20 Sep 1939
- Princess Roza Swiatopelk-Czetwertynski+ b. 1 Apr 1914, d. May 1990
- Princess Marie Elizabeth Swiatopelk-Czetwertynski+ b. 21 Mar 1920
Prince Jerzy Swiatopelk-Czetwertynski
Children of Prince Jerzy Swiatopelk-Czetwertynski and Countess Roza Zoltowska
- Prince Michel Swiatopelk-Czetwertynski b. 20 Nov 1938
- Princess Marie Swiatopelk-Czetwertynski b. 22 Nov 1939, d. 15 Feb 1941
- Princess Anna Swiatopelk-Czetwertynski b. 17 Feb 1947
- Prince Stanislaw Swiatopelk-Czetwertynski+ b. 17 Nov 1949
- Princess Maria-Anna Swiatopelk-Czetwertynski b. 3 Mar 1954
Countess Roza Zoltowska
Her married name became Swiatopelk-Czetwertynski.
Children of Countess Roza Zoltowska and Prince Jerzy Swiatopelk-Czetwertynski
- Prince Michel Swiatopelk-Czetwertynski b. 20 Nov 1938
- Princess Marie Swiatopelk-Czetwertynski b. 22 Nov 1939, d. 15 Feb 1941
- Princess Anna Swiatopelk-Czetwertynski b. 17 Feb 1947
- Prince Stanislaw Swiatopelk-Czetwertynski+ b. 17 Nov 1949
- Princess Maria-Anna Swiatopelk-Czetwertynski b. 3 Mar 1954
Prince Michel Swiatopelk-Czetwertynski
- [S1439] Michel Czetwertynski, “re: Michel Czetwertynski,” e-mail message to British and European Nobility Register, 30 August 2005. Hereinafter cited as “re: Michel Czetwertynski.”
Prince Stanislaw Swiatopelk-Czetwertynski
Children of Prince Stanislaw Swiatopelk-Czetwertynski and Marjolaine Plucinska
Marjolaine Plucinska
Children of Marjolaine Plucinska and Prince Stanislaw Swiatopelk-Czetwertynski
