+---- Jacob Jan Gerritsz. ca 1450-1500/
+---- Jan Jacobsz. ca 1475-
| +---- Dirckje Jansdr. †
+---- Anthonis Jansz. ca 1505-
| +---- Claesgen Gerritsdr. †1565
==== Cornelis Ruijchrok
| +---- Harper Dircksz. ca 1485-1542/
+---- Machtelt Harpertsdr. ca 1510-
+---- ? ?
|