Izsák was born on July 11th, 1873 in Budapest.1 Izsák's father was Jakab De Majo and his mother was Sára Gabay. He had a brother and two sisters, named Sándor, Luna and Janka. He was the oldest of the four children.
General Notes
Sachs Aranka a felesége, 1911.5.3-án esküdtek a VIII. ker-ben https://familysearch.org/ark:/61903/3:1:S3HT-DTDS-8MV?mode=g&i=201&cc=1452460 Itt Jakab az apja Gabay Sára az anyja