| 1. | KOSTER, Willem Jansz was christened 22 Sep 1737, Hoogvliet, Rotterdam, Zuid-Holland, Netherlands; died 6 Dec 1798, Poortugaal, Albrandswaard, Zuid-Holland, Netherlands. Willem married RUIJSEVELT, Pietertje Jansdr 17 Oct 1762, Poortugaal, Albrandswaard, Zuid-Holland, Netherlands. Pietertje (daughter of RUIJSEVELT, Jan Wijnandsz and GROENEWEG, Pieternella Jansdr) was christened 20 Feb 1734, Rhoon, Rhoon, Zuid-Holland, Netherlands; died 20 Aug 1810, Poortugaal, Albrandswaard, Zuid-Holland, Netherlands. [Group Sheet]
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1737 - 1798 (~ 61 years)