Jacob Furth was a son of Levie Furth and Rachel Samuel Dekker. He married in Amsterdam on 17 December 1902 to Mina Verdoner, who passed away there on 17 January 1935. The couple had four children: Juda, Levie (who died in infancy), Elias and Rachel.
City Archive of Amsterdam, archive cards of Elias and Jacob Furth.