My grandparents Jacob Goldsmit & Kaatje Levie
Jacob's parents Philip Goldsmit & Roosje Mogendorff
Philip's parents Jacob Meijer Goldsmit & Marlina van Gelder (born Lochem)
Marlina's parents Simon Markus van Gelder & Feijken van Gelder
Feijken's parents Philip Leijsder van Gelder & Judith Abraham
Philip's father Leyzer Philip van Gelder
Also; my mother's parents George Cohen and Theodora Roozendaal
Theodora's parents Ephraim Roozendaal & Hendrina Elkus
Ephraim's parents Salomon David Roozendaal & Johanna van Gelder
Johanna's parents Leijser Philip van Gelder & Amalia Casper Cohen
Leijser's parents Philip Leijsder van Gelder & Judith Abraham
Feijken and Leijser were brother and sister
I have been in contact with Johan van Gelder and have his book.
I have been in contact with Caroliene Alyda de Wied who is related to Leizer Simon van Gelder also known as Louis Simon de Weid and his wife Billeken Levy Roos.
I have been in contact with Silvia Carloina Neumann-Grunebaum who is related to Leijser Philip van Gelder & Amalia Casper Cohen.
I have been in contact with Sayah Ticho-Swartenberg who is related to the Koekkoek family thru her father and thru her mother to Salomon Philip (David) van Gelder & Sophia Levie Koopmans/Samuels