Descendants of Jacob Cornelisz BLOK and Guurtjr Gerrits KEIJZER
 Second Generation 
2. Jan Jacobs BLOK (Jacob Cornelisz1) was born on January 22, 1741 in Wormer, , Noord-Holland, Netherlands and died in De Rijp, , Noord-Holland, Netherlands.
Jan married Anna Jacobs on October 21, 1759 in De Rijp, , Noord-Holland, Netherlands. Anna was born in 1734 in De Rijp, , Noord-Holland, Netherlands, was christened on May 23, 1734 in De Rijp, , Noord-Holland, Netherlands, and died on April 20, 1828 in De Rijp, , Noord-Holland, Netherlands at age 94.
The child from this marriage was:
+ 3 i. Marijtje Jans BLOK was born in August 1760 in De Rijp, , Noord-Holland, Netherlands, was christened on August 31, 1760 in De Rijp, , Noord-Holland, Netherlands, and died on March 15, 1827 in Krommenie, , Noord-Holland, Netherlands at age 66.
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