Willem Schaap was a son of Abraham Schaap and Roosje Heilbron. He married 5 December 1906 in Amsterdam to Elisabeth Groen, daughter of Juda Groen and Vrouwtje Haringman. The couple had three children: Abraham, Juda and Philip.
A sister of Willem Schaap was Marianna Schaap, spouse of Benjamin Visjager.
City Archive of Amsterdam, archive card of Willem Schaap and website www.wiewaswie.nl.
Biography