Descendants of Gerrit IJFS and Neeltje Jans NIEROP
 Second Generation 
2. Jan Gerritsz IJFS (Gerrit1) was born in 1764 in Koedijk, , Noord-Holland, Netherlands1 and died on November 17, 1819 in Koedijk, , Noord-Holland, Netherlands1 at age 55.
Jan married Grietje Cornelis de GROOT.
The child from this marriage was:
+ 6 i. Gerrit Jansz IJFS was born about 1794 in Koedijk, , Noord-Holland, Netherlands2 and died on May 13, 1827 in Koedijk, , Noord-Holland, Netherlands2 about age 33.
Jan next married Grietje Simonsd BOENDER, daughter of Simon BOENDER and Maartje Jans de GROOT. Grietje was born in 1766 in Koedijk, , Noord-Holland, Netherlands1 and died on June 9, 1846 in Koedijk, , Noord-Holland, Netherlands1 at age 80.
Children from this marriage were:
7 i. Neeltje Jans IJFS was born in 1806 in Koedijk, , Noord-Holland, Netherlands1 and died on March 9, 1829 in Koedijk, , Noord-Holland, Netherlands1 at age 23.
Neeltje married Cornelis Pietersz ZWETSMAN, son of Pieter ZWETSMAN and Maartje Cornelisd de RUIJTER, on April 29, 1827 in Koedijk, , Noord-Holland, Netherlands.1 Cornelis was born in 1805 in Koedijk, , Noord-Holland, Netherlands.2
8 ii. Jannetje Jans IJFS was born in 1810 in Koedijk, , Noord-Holland, Netherlands1 and died on November 2, 1834 in Koedijk, , Noord-Holland, Netherlands1 at age 24.
Jannetje married Dirk SLUIS, son of Fredrik SLUIS and Grietje BOLDEWIJN, on October 16, 1831 in Koedijk, , Noord-Holland, Netherlands.1 Dirk was born in 1811 in Koedijk, , Noord-Holland, Netherlands.1
5. Jacob Gerritsz IJFS (Gerrit1) was born in 1776 in Oudkarspel, , Noord-Holland, Netherlands1 and died on April 18, 1845 in Koedijk, , Noord-Holland, Netherlands1,2 at age 69.
Jacob married Elisabeth OLIJ. Elisabeth was born in 1779 in Ursem, Koggenland, Noord-Holland, Netherlands1 and died on February 13, 1848 in Koedijk, , Noord-Holland, Netherlands1,2 at age 69.
Children from this marriage were:
+ 9 i. Geertje IJFS was born on October 21, 1800 in Koedijk, , Noord-Holland, Netherlands1,2,3 and died on February 14, 1890 in Koedijk, , Noord-Holland, Netherlands1 at age 89.
10 ii. Grietje IJFS was born in 1806 in Koedijk, , Noord-Holland, Netherlands1 and died on January 10, 1848 in Koedijk, , Noord-Holland, Netherlands1 at age 42.
+ 11 iii. Jacob Jacobsz IJFS was born in 1807 in Koedijk, , Noord-Holland, Netherlands1 and died on January 10, 1848 in Koedijk, , Noord-Holland, Netherlands1 at age 41.
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