XVx. Cornelis Geertruyus Kolff, born Rotterdam 28 Feb. 1863, member firma Lukwel & Tiele, makelaars in tabak, deceased Rotterdam 21 Aug. 1932, married Rotterdam 16 Nov. 1893 Jeannette Roelandia Ruys, born Rotterdam 1 Jan. 1871, deceased there 22 May 1939, daughter of Willem and Maria Cankrien.
From this marriage:
1. Gualtherus Kolff, born Rotterdam 18 Sept. 1894, deceased there 21 Dec. 1905.
2. Willem, follows XVIy.
3. Cornelis Geertruyus, follows XVIz.

XVIy. Willem Kolff (Member of Honour) (Board 1926/1951-1970, see note), born Rotterdam 16 Oct. 1898, member firma Lukwel & Tiele, makelaars in tabak there, deceased Leidschendam 9 June 1981, married 1st Rotterdam 3 Apr. 1924 Francina Hoffman van Hove, born Rotterdam 19 Dec. 1903, deceased Voorschoten 16 March 1945, daughter of Johann Martin Godfried and Jeanne Françoise Marie Scheltus van IJseldijk; married 2nd Driebergen-Rijsenburg 15 Feb. 1951 Jantje Scheffer, born Rhenen 10 Aug. 1922, deceased Wassenaar 23 Sept. 2002, daughter of Gijsbert and Jantje van den Bosch.
From the first marriage:
1. Cornelis Geertruyus, follows XVIIcc.
2. Martin Kolff, born The Hague 23 Feb. 1935, oud-onderwijzer, married Driebergen-Rijsenburg (divorce reg. there 19 Nov. 1981) Lilian Nelly Jacqueline Rooswinkel, born Roermond 23 Oct. 1942, verpleegkundige, daughter of Joseph Lodewijk and Sophia Maria Christina Reyners; she remarried Mr. Robert Frank de Vooijs, divorced spouse of Agnes Kolff (see this branch: XVIbb2).

XVIIcc. Ing. Cornelis Geertruyus Kolff (Board 1969-2002), born The Hague 24 June 1930, elektrotechn. ing., directeur-eigenaar Diana Yacht Design B.V. at Haarlem, married Zandvoort 18 June 1960 Johanna Elisabeth Graffelman, born Amsterdam 10 Jan. 1932, daughter of Albertus Jacob and Grietje de Vries.
From this marriage:
1. Diederik Willem, follows XVIIIw.
2. Julius Albert, follows XVIIIx.

XVIIIw. Diederik Willem Kolff, born The Hague 16 Apr. 1963, officier-jachtvlieger Noorse luchtmacht.
From his relation with Camilla Marie Krog, born Bergen (Noorwegen) 4 Sept. 1967, daughter of Peder Oluf Pedersen and Tora Kristine Krog:
1. Julia Kristiane, born York (England) 4 July 1994.
2. Tora Josephine, born Oslo (Norway) 18 June 1999.
3. Vincent Gregard, born Oslo (Norway) 9 May 2002.

XVIIIx. Julius Albert Kolff (Board 2002- ), born Haarlem 14 May 1973, pilot K.L.M., married Amsterdam 22 Nov. 2003 Marieke de Maat (born ..., daughter of ...).
From this marriage:
1. Boris Cornelis Kolff, born Amsterdam, 5 Nov. 2007.
2. Isa Johanna, born Hoofddorp, 11 Dec. 2010.

XVIz. Cornelis Geertruyus Kolff, born Rotterdam 10 July 1905, directeur N.V. Aanneming Mij. P.J. van Eesteren at Rotterdam, deceased Wilrijk (Antwerpen) 16 June 1981, married 1st Rotterdam 21 Apr. 1927 (divorce reg. there 17 Nov. 1938) Jkvr. Louise Francina de Geer van Jutphaas, born Lekkerkerk 23 Sept. 1904, deceased Rotterdam 17 July 1973, daughter of Louis and Francina Petronella van Oort; she remarried Holborn (Londen) 19 Jan. 1939 Henri Frederick van Zijst; married 2nd Rotterdam 15 Sept. 1939 Cornelia Johanna Cécilia de Waal, born Rotterdam 13 Nov. 1911, deceased Wassenaar 17 March 2006, daughter of Hendrik Ferdinand and Caronline Maria Bland van den Berg and divorced spouse of Gualtherus Kolff (see this branch XVIbb).
From the first marriage:
1. Jeannette Roelandina Kolff, born Overschie 9 Feb. 1928, oud-lerares koken and voedingsleer huishoudschool, married 1st Bloemendaal 1 Aug. 1953 (divorce reg. there 3 May 1962) Cornelis Adrianus van der Plas, born Amsterdam 3 Sept. 1927, verkoopleider, deceased Mexico City 11 Feb. 1970, son of Gerardus and Femma de Groot; married 2nd Bloemendaal 15 Sept. 1967 Frederik Heyman, born Batavia 19 Feb. 1909, handelsarbitragant bij Organon B.V. at Oss, oud-luitenant-ter-zee 2nd kl. K.M.R., deceased Aerdenhout 3 May 1970, son of Christiaan and Johanna Frederieka Wilhelmina Kyftenbelt and gesch. echtg. van 1st Sonja Swensen and 2nd Greta Boltjes; married 3rd Bloemendaal 2 Aug. 2005 Daniël Johannes van Baarsen (R.O.N.), born Amsterdam 10 June 1922, fabrikant, deceased Bloemendaal 24 April 2009, son of Nicolaas and Sophia Anna Maria Hanekamp, eerder gehuwd met Henriette Antonia Aloysia Bakker, born Amsterdam 21 June 1923, deceased Bennebroek 19 Feb. 1996.
2. Louise Francina Cornélie Kolff, born Overschie 25 June 1930, deceased Veldhoven 20 januari 2005, married 1st Overschie 10 Aug. 1951 Hugo Henri van Dobben, born Swatow (China) 4 March 1925, luitenant-ter-zee 2nd kl., employed with Phs. van Ommeren N.V. at Rotterdam, deceased Leiden 7 Jan. 1958, son of Alexander Leonard Wilhelm and Margaretha Wilhelmina van Zijst; married 2nd Vlissingen 16 July 1959 Reinhard Leonard Hintzen, born Mijnsherenland 4 July 1928, luitenant-ter-zee K.M.R. 1963-1973, oud-bedrijfsdirecteur Philips' Gloeilampenfabr. N.V., deceased Veldhoven 1 March 2013, son of Mr. Herman Carel and Carolina Johanna Jacoba Pels Rijcken.
3. Cornelis Barthold, follows XVIIdd.
From the second marriage:
4. Sylva Cornelia Johanna Cecilia Kolff, born Overschie 16 Aug. 1942, married Rotterdam 13 March 1965 Drs. Bernard Donker, born Schiedam 5 Jan. 1936, econ. drs., directeur Papiergroothandel Riem & Honig., son of Johan Christiaan and Sara Helena Maria Tjeenk Willink.

XVIIdd. Cornelis Barthold Kolff, born Overschie 22 Jan. 1933, bedrijfassistent KEMA at Arnhem, deceased there 28 March 1974, married Zutphen 3 May 1955 Antoinette Johanna Alma Engelkamp, born Medan 9 Jan. 1934, daughter of Bernardus Cornelis and Jeanette Antonia Gravestein.
From this marriage:
1. Monique Antoinette Kolff, born Velp 16 June 1959, married 1st Arnhem 28 June 1985 (divorce reg. there 18 March 1996) Jan Paul Hilverink, born Arnhem 1 Apr. 1960, rayonmanager, son of Karel Rinke and Emilie Yvonne Pieete; married 2nd Denekamp 16 May 2003 Petrus Philippus Sylvester Tiehatten, arts, born Enschede 1 Jan. 1955, son of Marinus Eduard Bernard and Josephina Maria Lormans.
2. Peter Cornelis Kolff (Board 1987-1990), born Velp 31 July 1961, horeca-ondernemer.
3. Cornelis Geertruyus, follows XVIIIdd.

XVIIIdd Cornelis Geertruyus Kolff (Board 1990-2008), born Velp 22 March 1966, aircraft pilot, married Doesburg 28 May 1993 Monique Geertrudis Mari Kamphuis, born Doesburg 23 May 1967, arts, daughter of Hendrikus Bernardus and Maria Wilhelmina Elisabeth van der Aa.
From this marriage:
1. Marit Antoinette Elisabeth Kolff, born Maastricht 4 Oct. 1997.
2. Cornelis Barthold Kolff, born Maastricht 31 Aug. 1999.
3. Rosan Monique Kolff, born Maastricht 8 May 2001.

XVy. Gualtherus Kolff (1st Heerendiner) (De Colve XIII), born Rotterdam 28 June 1867, commissionair in effecten at Amsterdam, deceased Aachen 9 Jan. 1935, married Prague 12 Apr. 1898 Helene Mathilde Voss (De Colve I), born Prague 7 March 1880, deceased Amersfoort 15 Feb. 1971, daughter of Louis Georg and Paulina Franciska Spitzer.
From this marriage:
1. Mathilde Kolff (De Colve I) (De Colve XIII), born Amsterdam 8 Jan. 1899, deceased Amersfoort 31 March 1970.
2. Gualtherus Louis, follows XVIaa.

XVIaa. Gualtherus Louis Kolff (Biographies 1939-1950) (De Colve XIII), born Amsterdam 29 Jan. 1911, directeur kwekerij Waterdaal N.V., res.-officier cav., latst. 1st luitenant, deceased Basel 11 Apr. 1985, married The Hague 18 Oct. 1938 Charlotte Enger, born Leeuwarden 18 Dec. 1914, deceased Amersfoort 31 July 1997, daughter of Mr. Emile François and Gijsbertha Wilhelmina van Eck.
From this marriage:
Gijsbertha Wilhelmina Kolff (Board 1977-1983) (De Colve XIII), born The Hague 1 Nov. 1939, florist, married 1st Leusden 17 Sept. 1966 (divorce reg. there 4 Aug. 1975) Jhr. Arnoud Jan Hendrik de Beaufort, born Basel 19 Oct. 1941, Diploming. agr. E.T.H., hoogheemraad Hoogheemraadschap De Stichtse Rijnlanden at Nieuwegein, director Stichting Rioned at Ede, member Prov. Staten van Utrecht 1974-1987, son of Ferdinand and Erica Bubeck; he remarried Karlsruhe 16 Sept. 1977 Magdalena Sutter; married 2nd Amersfoort 16 Dec. 1975 Jan Hendrik Wilhelm Nix (O.O.N., B.I.), born Goenoeng Sitoli (Sumatra, Neth. East India) 17 Sept. 1912, kolonel cav. b.d., deceased Amersfoort 4 Apr. 1999, son of Marie Cornelis and Alice Constance Botellho and divorced spouse of Lydia de Graaff.

XVz. Herman Kolff (1st Heerendiner), born Katendrecht 3 June 1870, member firma Moens & Kolff at Rotterdam, deceased Velp 17 Apr. 1945, married Rotterdam 6 June 1901 Elisabeth Cornelia Messchaert, born Rotterdam 15 March 1874, deceased Leiden 28 Sept. 1945, daughter of Dr. Nicolaas and Cornelia Bicker Caarten.
From this marriage:
1. Sara Lydia Kolff (De Colve I) (Biographies), born Rotterdam 19 May 1902, deceased Leerdam 25 June 1987, married 1st The Hague 5 March 1927 (divorce reg. there 23 Feb. 1935) Mr. Willem Marinus Kolff (see XVIe.); married 2nd The Hague 9 July 1941 Hendrik Leonard Oudenhoven (Biographies 1939-1950), born Meerssen 11 March 1885, gezagvoerder Rotterdamsche Lloyd, kapitein-luitenant-ter-zee K.M.R., deceased Schiedam 3 July 1953, son of Willem Frederik Leonard and Antje Heynis and wid. of Christina Johanna van Dorp.
2. Mr. Nicolaas Kolff (Board 1938-deceased) (De Colve I), born Rotterdam 28 Oct. 1904, jur.ac.litt.drs., deceased Bad Oeynhausen (Nordrhein-Westfalen) 17 May 1969, married Voorburg 17 (in church 20) Oct. 1950 Maria Wilhelmina Vernes (De Colve I), born Rotterdam 28 June 1917, deceased Voorschoten 18 July 2007, daughter of Elias and Eva Dorothea Buttstedt.
3. Gualtherus, follows XVIbb.

XVIbb. Gualtherus Kolff, born Rotterdam 27 Nov. 1907, former executive director N.V. Slavenburg's Bank, Rotterdam, member fa. Arn. Theod. Sölling & Co., director Kolff's Im- and Export Mij. N.V., sports commissionary K.N.A.C., deceased in airplane on the way from Amsterdam to Curaçao 17 Apr. 1982, married 1st Rotterdam 12 Apr. 1934 (divorce reg. there 18 Aug. 1937) Cornelia Johanna Cecilia de Waal, born Rotterdam 13 Nov. 1911, deceased Wassenaar 17 March 2006, daughter of Hendrik Ferdinand and Cornelia Maria Bland van den Berg; she remarried Rotterdam 15 Sept. 1939 Cornelis Geertruyus Kolff (see this branch: XVIz); married 2nd Rotterdam 31 Oct. 1939 Antoinette Maria Cornelia Goossens, born Rotterdam 16 Feb. 1915, deceased Zwitserland 12 March 2006, daughter of Jan Karel Willem Frederik and Johanna Cornelia Pauline Castendijk.
From the first marriage:
1. Caroline Kolff, born Overschie 16 Feb. 1935, med.-secretaresse, married Amsterdam 27 May 1983 Petrus Lambertus Nieuwenhuys, born Amsterdam 28 Jan. 1936, adjunct-directeur ABN AMRO Genève (Zwitserland), son of Hendrikus Wilhelmus Christianus and Marianne van Hees and divorced spouse of Henriette Fréderique Françoise Sark
2. Agnes Kolff (Board 1968-2004) (Quiz 2001), twin with previous, born Overschie 16 Feb. 1935, married 1st Rotterdam 7 June 1958 (divorce reg. there 11 Dec. 1981) Mr. Robert Frank de Vooys, born Rotterdam 2 Apr. 1926, directeur N.V. Van Stolk & Reese, papiergroothandel and enveloppenfabriek, son of Gerrit Cornelis and Marie Louise Utermark; hij remarried Lilian Nelly Jacqueline Rooswinkel, divorced spouse of Martin Kolff (see this branch: XVIy.2); married 2nd Rotterdam 28 Aug. 1987 Prof. Dr. Dirk Martinus Nicolaas van Wensveen, born Rotterdam 6 March 1933, dr.econ.wetensch. Rotterdam 1966, bankier, oud-voorzitter hoofddirectie Bank Mees & Hope N.V. 1975-1993, president board MeesPierson 1994-1998, bijzonder hoogleraar financiële instellingen Universiteit van Amsterdam, bijzonder hoogleraar Erasmus Universiteit Rotterdam, son of Willem and Aletta Maria Bergwerf and divorced spouse of Else Louise Maingay.
From the second marriage:
3. Gualtherus Jan, follows XVIIee.
4. Elisabeth Henriëtte Kolff, born Wassenaar 15 Feb. 1944, secretaresse, married 1st Wassenaar 28 May 1965 (divorce reg. there 15 May 1981) Bernd Thomas Franz Otto Breitbarth, born Berlijn 29 May 1938, koopman, son of Franz and Ludowika Maria Johanna Martha vom Rath; married 2nd Rotterdam 24 Nov. 1994 Gustaaf Adolph Drijver, born Rotterdam 20 Sept. 1939, directeur Drijver and Partners, son of Gustaaf Adolph and Maria Groetje Bakker and gesch. echtg. van Elisabeth Iburg.
5. Antoinette Cornelia Ernestine Kolff, born Wassenaar 21 May 1948, married Wassenaar 12 Oct. 1968 Hendrik Gustaaf Moorrees, born Bandoeng 25 March 1942, directeur CITCO Bank Nederland B.V., son of Hendrik Gustaaf and Elisabeth Cornelie Elise van Riemsdijk.

XVIIee. Gualtherus Jan Kolff, born Rotterdam 18 Dec. 1940, general manager Rotterdam Freight Agencies B.V., married Rotterdam 22 Sept. 1967 Maayke van der Hoeven, born Leiden 13 Feb. 1941, daughter of Joachim Pieter and Wilhelmina Hermana Alexandrina Elisabeth de Blécourt.
From this marriage:
1. Gualtherus Jeroen, follows XVIIIee.
2. Merel Willemijn Kolff, born Rotterdam 1 Sept. 1976, studente radiotherapie AMC, married Amsterdam 30 June 2006 Joggem Simons.

XVIIIee. Gualtherus Jeroen Kolff, born Rotterdam 4 Nov. 1970, married Wageningen, 18 Aug. 2000, Jeanne-Marie van Spronsen (divorce reg. [unknown]), 2nd partnered with Milène Verlee.
From the 1st relation:
1. Ninne Elisabeth Willemijn, born Rotterdam 4 Jan. 1999.
From the 2nd relation:
2. Pien Maayke Nadine Kolff, born Rotterdam 29 Jan. 2009.
3. Jet Margaretha Irene Kolff, born Rotterdam 2 Aug. 2012.