Joseph Hornman was the eldest of the two sons of Simon Hornman and Sara Davidson. His parents married in Rotterdam on 8 June 1892 and two years later, on 24 Februray 1894 Joseph was born there as the first child, named after his grandfather. A few years later, Simon had a brother, Jacob, who was born 2 April 1902 in Rotterdam.
Joseph married the 27-year old Margaretha Marx in Rotterdam on 16 Febru…