┌── Albert Clasen (Date unknown - Date unknown)

         ┌── Geert Alberts Groenewoud(Friday 01 May 1750 Zuidbroek, Groningen, Nederland - Wednesday 04 June 1828 Nieuwe Pekela,
         │   Groningen, Nederland)

         │     └── Lijsbeth Geerts (Date unknown - Date unknown)

   ┌── Albert Geerts Groenewoud (Nieuwe Pekela, Groningen, Nederland;Tuesday 11 April 1780 - Tuesday 29 February 1848)

   │     └── Engeltje Harms (1750 - Saturday 28 December 1833 Nieuwe Pekela, Groningen, Nederland)

Derk Alberts Groenewoud(Saturday 12 November 1803 Nieuwe Pekela, Groningen, Nederland - Wednesday 11 April 1888 Onstwedde,
 Groningen, Nederland)

   │                 ┌── Derck Jans Suirinck (Date unknown - Date unknown) =>

   │           ┌── Jan Dercks Suirinck (Date unknown - Sunday 14 June 1789 Midwolda, Groningen, Nederland)

   │           │     └── Sijcke Gosses Heijema (About 1687 Midwolda, Groningen, Nederland - Date unknown) =>

   │     ┌── Derk Jans Suurling (Beerta, Groningen, Nederland;Between 1748 and 1749 - Sunday 24 April 1808)

   │     │     └── Aeltien Jans (About 1725 - Before 05 March 1784 Midwolda, Groningen, Nederland)

   └── Aaltje Derks Suurling (1779 Beerta, Groningen, Nederland - Saturday 15 July 1854 Nieuwe Pekela, Groningen, Nederland)

         └── Grietje Harms Kotter (About 1754 Beerta, Groningen, Nederland - Date unknown)