┌── Jan Klasens Bouwman (Date unknown - Date unknown)

   ┌── Klaas Jans Bouwman(About 1766 Wymeer, Ostfriesland, Niedersachsen, Deutschland - Sunday 29 December 1822 Oudeschans,
   │   Bellingwolde, Groningen, Nederland)

   │     └── Imke Wessels (Date unknown - Date unknown)

Harm Klaassens Bouwman (Saturday 24 October 1801 Oudeschans, Bellingwolde, Groningen, Nederland - Date unknown)

   │     ┌── Roelf Bakker (Date unknown - Date unknown)

   └── Zwaantje Roelfs Bakker(About 1761 Oudeschans, Bellingwolde, Groningen, Nederland - Saturday 29 December 1838 Winschoten,
       Groningen, Nederland)

         └── Zwaantje Harms (Date unknown - Date unknown)