Clasina Elisabeth Tönjes1
From 22 February 1912, her married name became Olsen.1
Child of Clasina Elisabeth Tönjes and Frithiof Guttorm Erik Olsen
- Frithiof Olsen+1 b. 12 Jul 1916
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
Georg Ludvig Olsen1
Child of Georg Ludvig Olsen and Hansine Frederikke Christiane Birck
- Frithiof Guttorm Erik Olsen+1 b. 27 Oct 1882
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
Hansine Frederikke Christiane Birck1
Child of Hansine Frederikke Christiane Birck and Georg Ludvig Olsen
- Frithiof Guttorm Erik Olsen+1 b. 27 Oct 1882
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
Matilda Nagle1 
From 1846, her married name became Jessup.1
Children of Matilda Nagle and Alfred du Pont Jessup
- Mathilda Jessup+1 b. 1860, d. 13 Nov 1882
- Augustus Edward Jessup+1 b. 20 Jun 1861, d. 16 Oct 1925
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
Alfred Claude Jessup1 
He was a chemical and metallurgical engineer.1
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
Madeleine Montet1
Her married name became Jessup.1
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
Alexander Marion Jessup1 
Child of Alexander Marion Jessup and Carmen de Mirondo
- Alexander Anthony Jessup1 b. 1921
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
Carmen de Mirondo1
Her married name became Jessup.1
Child of Carmen de Mirondo and Alexander Marion Jessup
- Alexander Anthony Jessup1 b. 1921
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
Alexander Anthony Jessup1
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
Oliver Howell1
- [S6448] Bram Sonneveld, “re: Oppenheimer Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 27 November 2012. Hereinafter cited as “re: Oppenheimer Family.”
