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Marriage 13 October 1906 -- Hoogezand, Hoogezand-Sappemeer, Groningen, NetherlandsTrijntje Rubingh 
(I13367) Birth 25 January 1883 -- Martenshoek, Hoogezand-Sappemeer, Groningen, Netherlands
Number of Children: 4 
Jakob Geert Olthof 
(I23807) Birth 31 January 1907 -- Kropswolde, Hoogezand-Sappemeer, Groningen, Netherlands
1 . 1Frederika Annechina Olthof
(I23808) Birth 21 September 1908 -- Kropswolde, Hoogezand-Sappemeer, Groningen, Netherlands
1 . 2- Marriage 8 December 1927 -- Hoogezand, Hoogezand-Sappemeer, Groningen, Netherlands
Evert Radema
(I23810) Birth 7 August 1903 -- Foxhol, Hoogezand-Sappemeer, Groningen, Netherlands
Unknown children
Geert Jakob Olthof
(I23809) Birth 20 December 1910 -- Kropswolde, Hoogezand-Sappemeer, Groningen, Netherlands
1 . 3Anne Olthof
(I24854) Birth January 1916 -- Hoogezand, Hoogezand-Sappemeer, Groningen, Netherlands
Death 15 February 1916 (Age approx. 1 month) -- Hoogezand, Hoogezand-Sappemeer, Groningen, Netherlands
1 . 4