Jacob van Spier was a son of Markus van Spier and Saartje Levie. He married on 17 January 1902 in Culemborg to Sophia Belia van Spier, daughet of Isak van Spier and Belia Schenk. Sophia passed away in Hilversum on 20 April 1928, age 52.
Levie van Spier was a son of both of them.
Genlias and City Archive of Amsterdam, archive card of Levie van Spier.
Jacob van Spier married Klaartje van Bergen in 1936 in Hilversum. They did not live together anymore during the war.
Stadsarchief Amsterdam, archiefkaart Klaartje van Bergen