4 Generation Circle Diagram: |
| Catharina Kooiker
Pedigree Tree Descendancy Chart Ancestry Chart Compact Chart Circle Diagram Hourglass Chart Jan Grondstra < Tjalling Grondstra < Harmen Grondstra |
| Jan Grondstra
Pedigree Tree Descendancy Chart Ancestry Chart Compact Chart Circle Diagram Hourglass Chart Catharina Kooiker < Tjalling Grondstra < Harmen Grondstra |
| Tjalling Grondstra
Pedigree Tree Descendancy Chart Ancestry Chart Compact Chart Circle Diagram Hourglass Chart Johanna Theodora Huizenga Sibling Harmen Grondstra |