(Saturday 10 September 1859 - Friday 24 January 1941 Groningen, Groningen, Nederland)
Lucretia Zierts (Saturday 12 March 1864 Assen, Drenthe, Nederland - Tuesday 09 January 1945 Groningen, Groningen, Nederland)
(. Wednesday 09 August 1899 Assen, Drenthe, Nederland)
   ├─ Kathariena Hillegonda Dijkman (Sunday 18 April 1897 Assen, Drenthe, Nederland - Sunday 23 July 1916 Groningen, Groningen,
   │ Nederland)
   └─ Harmanna Dijkman (Wednesday 30 May 1900 Assen, Drenthe, Nederland - Saturday 12 August 1933 Arnhem, Gelderland, Nederland)
    +
Sijbrand Jaarsma (Sunday 19 July 1896 Franeker, Friesland, Nederland - Date unknown)
    (. Thursday 20 May 1926 Groningen, Groningen, Nederland)
8 5 2 2 .
0 .