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Derk van Oort, birth 27 Dec 1874 Groningen, Nederland, died 26 Dec 1940 Groningen, Nederland, occupation: brievenbest./kleermaker, son of Jacobus van Oort and Jacoba Mulder
 Married 22 Mar 1900 Groningen, Nederland to: Immechien Vos, birth 23 Dec 1875 Groningen, Nederland, died 21 Sep 1942 Groningen, Nederland, daughter of Klaas Langeveld Vos and Geertruida Noordberger  | 
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1) Jacoba van Oort, birth 17 Jan 1901 Groningen, Nederland, died 6 Jan 1994 Beilen, Drenthe, Nederland
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 Wijbe Jan Carel Lamers, birth 21 Nov 1900 Meppel, Drenthe, Nederland, died 20 Mar 1990 Groningen, Nederland, occupation: NS machinist, son of Carel Hendrik Jan Lamers and Jantje Bralts  | 
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2) Klaas van Oort, birth 30 Sep 1903 Groningen, Nederland, occupation: handelsreiziger
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 Jantina Veenstra, birth 12 Jul 1902 Groningen, Nederland, died 8 Jun 1989 Zwolle, Overijsel, Nederland 1st marriage 2nd marriage, daughter of Jacobus Veenstra and Diekje Drost  |