Wiardus married Odilia Amelia Rengers on 31 Dec 1798 in Hoogkerk, GR, NLD. Odilia (daughter of Duco Gerrold Rengers and Jeanette Gabrielle van Lintelo tot de Marsch) was born on 28 Jan 1779 in Groningen, GR, NLD; died on 08 Mar 1805 in Groningen, GR, NLD. [Group Sheet] [Family Chart]

1. Jhr. Mr. Johan Rengers Hora Siccama was born on 03 Sep 1801 in Groningen, GR, NLD; died on 25 Jan 1891 in Paterswolde, DR, NLD.
2. Duco Gerrold Rengers Hora Siccama was born on 27 Sep 1799 in Groningen, GR, NLD; died on 27 Jun 1854 in Hoogezand, GR, NLD.