David Pach was a son of Levie David Pach and Annaatje Groente. He married in Amsterdam on 23 March 1881 to Golde van Duijm, who passed away on 1 April 1928. The couple had five children together: Anna,(unmarried), Serline, Judic (who survived the Holocaust), Levie (passed away in 1930) and Hendrina.
City Archive of Amsterdam, archive card of David Pach.