Descendants of Gerrit IJFS and Neeltje Jans NIEROP
First Generation 
1. Gerrit IJFS was born in 1738 in Oudkarspel, , Noord-Holland, Netherlands and died on May 5, 1828 in Koedijk, , Noord-Holland, Netherlands at age 90.
Gerrit married Neeltje Jans NIEROP on April 28, 1765 in Koedijk, , Noord-Holland, Netherlands. Neeltje was born on December 1, 1737 in Koedijk, , Noord-Holland, Netherlands and died on January 5, 1797 in Koedijk, , Noord-Holland, Netherlands at age 59.
Children from this marriage were:
+ 2 i. Jan Gerritsz IJFS was born in 1764 in Koedijk, , Noord-Holland, Netherlands1 and died on November 17, 1819 in Koedijk, , Noord-Holland, Netherlands1 at age 55.
3 ii. Ijf Gerrirsz IJFS was born in 1766 in Koedijk, , Noord-Holland, Netherlands1 and died on August 5, 1832 in Koedijk, , Noord-Holland, Netherlands1 at age 66.
Ijf married Aafje RENS.
4 iii. Cornelis Gerritsz IJFS was born in 1769 in Koedijk, , Noord-Holland, Netherlands.1
Cornelis married Aafje Cornelisd GEUS, daughter of Cornelis GEUS and Maartje Jans KOSTER.
Cornelis next married Jannetje KNEIJNSBERG, daughter of Pieter KNEIJNSBERG and Maartje Jacobd MINNES, on November 29, 1818 in Koedijk, , Noord-Holland, Netherlands.1 Jannetje was born in 1795 in Zijpe, , Noord-Holland, Netherlands.1
+ 5 iv. Jacob Gerritsz IJFS was born in 1776 in Oudkarspel, , Noord-Holland, Netherlands1 and died on April 18, 1845 in Koedijk, , Noord-Holland, Netherlands1,2 at age 69.
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