4 Generation Circle Diagram: |
| Agnes van Averenck Pedigree Tree Descendancy Chart Ancestry Chart Compact Chart Circle Diagram Hourglass Chart Interactive Tree Derck Gelmers < Bertha Gelmers |
| Derck Gelmers Pedigree Tree Descendancy Chart Ancestry Chart Compact Chart Circle Diagram Hourglass Chart Interactive Tree Agnes van Averenck < Bertha Gelmers |
| Bertha Gelmers Pedigree Tree Descendancy Chart Ancestry Chart Compact Chart Circle Diagram Hourglass Chart Interactive Tree Otto van Voorst < Bernt van Voorst < Alexander van Voorst |