| Ancestry Chart: | 
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 Family with spouse
 Andries Jans Blaak
 Elsie Bouwina Blaak
 Derk Blaak
 Bouwina Elsie Blaak- Grietje Kleverenga  (I04471) Birth 22 January 1868 -- Hornhuizen, Kloosterburen, Groningen, Netherlands (I04471) Birth 22 January 1868 -- Hornhuizen, Kloosterburen, Groningen, Netherlands
 Death 7 May 1931 (Age 63) -- Hoogezand, Hoogezand-Sappemeer, Groningen, Netherlands
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