Izaak Davidson was a son of David Davidson and Rachel Slager. He married 16 March 1890 in Bolsward to Fronica de Lange, a daughter of Berend Gompels de Lange and Annetta Abrahams Lansberger. The couple had four children: David, Annetta, Rachel Berendina and Berend.
website www.wiewaswie.nl.
Izaäk Davidson and his family lived at 9 Wilhelminasingel in Zwolle, with their son David Davidson and his family. The wife of Izaäk Davidson survived the war.
D. Stibbe en J. Hagedoorn, Herinneringsboek joods Zwolle 1940-1945 (Zwolle 1995) 30-31