Willem married Grietje Pieters Boonstra on 27 Nov 1911 in Tietjerksteradeel, FR, NLD. Grietje (daughter of Pieter Johannes Boonstra and Joukje Jacobs Boeijsma) was born on 22 Jul 1876 in Grouw, Idaarderadeel, FR, NLD; died on 26 Mar 1951. [Group Sheet] [Family Chart]