Zoon van Moses Richheimer en Babette Mainhold‏.

Geboren ‎26 apr 1858 (12 Iyar 5618) Mannheim, Baden Wurtemberg, Duitsland‎, bronnen: Genealogie/Parenteel: Richheimer from Gemmingen, Gezinskaart Amsterdam (Gustave Morris Richheimer 1858)
Overleden ‎12 apr 1937 (1 Iyar 5697) Amsterdam, Noord-Holland, Nederland‎, leeftijd 78 jaar, bronnen: Gezinskaart Amsterdam (Gustave Morris Richheimer 1858), Overlijdensakte (Gustave Richheimer Amsterdam 1937/2486)
Begraven ‎14 apr 1937 (3 Iyar 5697) Diemen, Noord-Holland, Nederland, bron: Burial permit Diemen
Beroep: koopman in granen; vertegenwoordiger, bronnen: Antwerpen, vreemdelingen dossiers (dossier 66839 van Gustave Maurice Richheimer), Gezinskaart Amsterdam (Gustave Morris Richheimer 1858)
Gustave Maurice Richheimer came in May 1889 to Antwerp
Gustave (Morris) Richheimer came on September 19th 1919 as a widower from Antwerp to Amsterdam.
The documents from Antwerp say that he left for Holland in August 1914.
In the mail of Januar 25th 2008 Karen Strobel mentioned from the Stadtarchiv Mannheim:

Gustav Moritz Richheimer, *26.04.1858 in Mannheim, tradesman, he got the permission to leave to America in 16.05.1874. He came unmarried from America, New York back to Mannheim officially registered in 05.11.1879. He lived since 01.11.1879 under the address N2, 7, then D6, 6 and moved in 01.12.1880 to Basel (presumably Switzerland). As he did not have his own Familienbogen he is thought to be unmarried by that time. There is also a note that he lived in May 1889 in Antwerpen, Rue du Berceau Nr. 19, if he was married by that time cannot be proved., bronnen: Antwerpen, vreemdelingen dossiers (dossier 66839 van Gustave Maurice Richheimer), Gezinskaart Amsterdam (Gustave Morris Richheimer 1858)

Dochter van Antonius de Decker en Louisa Anna Maria Groesser‏.

Geboren ‎1 feb 1866 (16 Shevat 5626) Antwerpen, Belgie‎, bronnen: Persoonskaart CBG (Sidney Gustave Richheimer 1896), , Antwerpen, vreemdelingen dossiers (dossier 66839 van Gustave Maurice Richheimer)
Overleden ‎± 1902‎, leeftijd ongeveer 36 jaar, bron:
Mirjam Factor - Richheimer vertelde, dat haar vader Sidney Gustave Richheimer 6 jaar oud was toen zijn moeder rond 1902 overleed.