Jacob and Aagtje lived in Hillegersberg
, Zuid-Holland, Netherlands, currently a suburb of Rotterdam. Although all their children were born in Hillegersberg, some eventually relocated to the Schoorl and the Zijpe areas.
Pieter LEEFLANG married Klasina van HAM in 1881. Klasina's mother was Janijtje KISTEMAKER
and through her Pieter's children would be 4th cousins twice removed to Case Vanderplas, the originator of this site.