Descendants of Jacob Cornelisz BLOK and Guurtjr Gerrits KEIJZER
First Generation 
1. Jacob Cornelisz BLOK, son of Cornelis BLOK, was born in 1705 in Enkhuizen, , Noord-Holland, Netherlands, was christened on January 6, 1705 in Enkhuizen, , Noord-Holland, Netherlands, and died on November 4, 1749 in Wormer, , Noord-Holland, Netherlands at age 44.
Jacob married Guurtje Gerrits KEIJZER, daughter of Gerrit KEIJZER, on November 15, 1727 in Wormer, , Noord-Holland, Netherlands. Guurtje was born in 1705 in Wormer, , Noord-Holland, Netherlands.
The child from this marriage was:
+ 2 i. Jan Jacobs BLOK was born on January 22, 1741 in Wormer, , Noord-Holland, Netherlands and died in De Rijp, , Noord-Holland, Netherlands.
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