First Generation 
—————————————————————————————————————————————

1. Johann Hahn.1 Born in 1639. Johann died in 1706; he was 67.

Johann married -- Engel1. Born in 1653. -- died in 1709; she was 56.

They had one child:
	2	i.	Jürgen (1670-1749)

Second Generation 
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2. Jürgen Hahn.1 Born in 1670. Jürgen died in 1749; he was 79.

Jürgen married Margareta Ohbrich1. Born in 1697. Margareta died in 1758; she was 61.

They had one child:
	3	i.	Adolph (1733-1784)

Third Generation 
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3. Adolph Hahn.1 Born in 1733. Adolph died in 1784; he was 51.

Adolph married Helena Mahler1. Born in 1738. Helena died in 1803; she was 65.

They had one child:
	4	i.	Jürgen (1770-1848)

Fourth Generation 
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4. Jürgen Hahn.1 Born in 1770. Jürgen died in 1848; he was 78.

Jürgen married Metha Hess1. Born in 1775. Metha died in 1848; she was 73.

They had one child:
	5	i.	Johann Christoph (1799-1884)

Fifth Generation 
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5. Johann Christoph Hahn.1 Born in 1799. Johann Christoph died in 1884; he was 85.2 Occupation: Hauszimmermann.2

Tante DO gives the death date as 1881.

Johann Christoph married Johanna Harder1. Born in 1808. Johanna died in 1887; she was 79.

They had one child:
	6	i.	Carl Heinrich Christoph (1841-1884)

Sixth Generation 
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6. Carl Heinrich Christoph Hahn.1 Born in 1841. Carl Heinrich Christoph died in 1884; he was 43. Occupation: Tischlermeister.2

Carl Heinrich Christoph married Dorothea Krellenberg1. Born on 18 Nov 1839. Dorothea died in 1918; she was 78.

They had the following children:
	7	i.	Mathilde (1869-)
	8	ii.	Georg Johann Christoph (1870-1918)
	9	iii.	Betty (1873-)
	10	iv.	Clara (1878-)

Seventh Generation 
—————————————————————————————————————————————

7. Mathilde Hahn.1 Born in 1869.

Mathilde Lichtwark wird bis 1967 im Adressbuch geführt, jedoch später mit anderer Adresse.2

Mathilde married Karl Lichtwark1. Born in 1859.2 Karl died in 1931; he was 72.

They had the following children:
	11	i.	Gertrud
	12	ii.	Lenie
	13	iii.	Carl

8. Georg Johann Christoph Hahn.1,3 Born on 13 Dec 1870 in Lübeck.1 Georg Johann Christoph died on 29 Nov 1918; he was 47.

On 20 Jun 1902 when Georg Johann Christoph was 31, he married Johanna Aarsse3, daughter of Louis Johan Jacobus Aarsse & Wilhelmina Fritz. Born on 8 Jun 1876. Johanna died on 22 Jan 1960; she was 83.

They had the following children:
	14	i.	Dora (Do) (1903-)
	15	ii.	Louis Carl Georg (1904-1995)
	16	iii.	Henriette (Jet) Elisabeth Auguste (1905-1930)

9. Betty Hahn.1 Born in 1873.

10. Clara Hahn.1 Born in 1878.

Eighth Generation 
—————————————————————————————————————————————

11. Gertrud Lichtwark.1

12. Lenie Lichtwark.1

13. Carl Lichtwark.1

14. Dora (Do) Hahn.3 Born on 28 Apr 1903.

Dora (Do) married Hugo Bosscha3. Born on 18 Dec 1899 in India.1 Hugo died on 16 Aug 1974; he was 74.4

15. Louis Carl Georg Hahn.1,3 Born on 1 Aug 1904. Louis Carl Georg died on 23 Sep 1995; he was 91.

The author of the family tree blueprint.

Louis Carl Georg married Henriette (Jet) Mooij3. Born on 22 Mar 1908.

They had the following children:
	17	i.	Johanna (Joke) (1929-)
	18	ii.	Herman Georg Louis (1930-)
	19	iii.	Henriëtte Dorothea (Jetty) (1932-)
	20	iv.	Louis Carel Georg (1946-)

16. Henriette (Jet) Elisabeth Auguste Hahn.5,3 Henriette (Jet) Elisabeth Auguste died on 10 May 1930; she was 24.5 Born on 25 Dec 1905 in Rotterdam.5

On 8 Mar 1929 when Henriette (Jet) Elisabeth Auguste was 23, she married Deonisius (Dik) Marius Nierstrasz6, son of Marius Adrianus Chretien Nierstrasz & Wilhelmina van der Most, in S’Gravenhage.7 Born on 19 Jun 1889 in 's-Gravenhage. Deonisius (Dik) Marius died on 8 Feb 1956; he was 66.8,9

His first name was 'Deonisius' instead of 'Dionisius" due to an error by an ignorant civic clerk.8

They had one child:
	21	i.	Hans (1930-)

Ninth Generation 
—————————————————————————————————————————————

17. Johanna (Joke) Hahn.3 Born on 21 Apr 1929.

Johanna (Joke) married Gerard Sebus3. Born on 27 Sep 1926. Gerard died on 14 Sep 1999; he was 72.

They had the following children:
	22	i.	Anna Henriette (Jet) (1955-)
	23	ii.	Richard (1957-)
	24	iii.	Gwendolyn (1958-)

18. Herman Georg Louis Hahn.10,3 Born on 24 Apr 1930.

19. Henriëtte Dorothea (Jetty) Hahn.10,3 Born on 14 Nov 1932.

Henriëtte Dorothea (Jetty) married Marinus Jan Buijtenhuijs11,3. Born on 30 Nov 1927.

Or “Buijtenhuijs”. Louis Hahn gives the birth date as Nov 31!

They had the following children:
	25	i.	Marjoleine Henriëtte Pompea (1958-)
	26	ii.	Christiaan Herman (Chris) (1959-)

20. Louis Carel Georg Hahn.1,3 Born on 8 Nov 1946.

Louis Carel Georg first married Gerda van Klingeren12. Born on 26 Aug 1948.

They had the following children:
	27	i.	Louis Carel George (1970-)
	28	ii.	Wijnand Matthijs (1971-)

Louis Carel Georg second married Adrianne Maria (Anke) Wigboldus10,11. Born on 13 Sep 1955.

They had the following children:
	29	i.	Joris Jelle Herman (1992-)
	30	ii.	Peter Paul Roelof (1994-)

21. Hans Nierstrasz.8 Born on 28 Apr 1930 in Nijmegen.

On 6 Apr 1957 when Hans was 26, he first married Meta Maria van den Bos8, daughter of -- van den Bos & Wilhelmina Hendrika Anna Giphardt, in Laren.8 Born on 2 Mar 1936 in Amsterdam. Meta Maria died in 1988; she was 51.

AKA Meta Vandenbos and Meta Hildebrand

They had one child:
	31	i.	Oscar (1957-)

Hans second married (Private)13.
On 18 Sep 1982 when Hans was 52, he third married Barbara Schumaker8. Born on 14 May 1941.

Tenth Generation 
—————————————————————————————————————————————

22. Anna Henriette (Jet) Sebus.3 Born on 16 Aug 1955.

Anna Henriette (Jet) married Paul Latour11, son of Jozef Henri Maria Latour & Anna Maria Klemann. Born on 29 Mar 1950.

They had the following children:
	32	i.	Anna (1989-)
	33	ii.	Maria (1991-)

23. Richard Sebus.3 Born on 28 Jun 1957.

24. Gwendolyn Sebus.3 Born on 14 Dec 1958.

According to Joke, 1959?!14

Gwendolyn married Michael van de Leur11. Born on 16 Nov .14

They had the following children:
	34	i.	Leonora Suzanne (1988-)
	35	ii.	Laurens Robert (1990-)
	36	iii.	Sophie Lisanne (1994-)
	37	iv.	Charlotte Helena (1994-)

25. Marjoleine Henriëtte Pompea Buijtenhuijs.10,3 Born on 27 May 1958.

Marjoleine Henriëtte Pompea married Okke Jan Ottens10,11. Born on 5 Jun 1962.10

They had the following children:
	38	i.	Hayo Marien (1992-)
	39	ii.	Jurjen Job (1995-)

26. Christiaan Herman (Chris) Buijtenhuijs.10,3 Born on 13 Jul 1959.

Christiaan Herman (Chris) married Karin Ellen Mijdendorp10. Born on 9 Jun 1964.

They had one child:
	40	i.	Michelle Lois (1997-)

27. Louis Carel George Hahn.15,12 Born on 9 Jun 1970.

28. Wijnand Matthijs Hahn.15,12 Born on 12 Jul 1971.

Wijnand Matthijs married Sandra Lettinck15. Born on 24 Apr 1971.

They had one child:
	41	i.	David Matthijs (1996-)

29. Joris Jelle Herman Hahn.10,11 Born on 11 Apr 1992.

30. Peter Paul Roelof Hahn.10,11 Born on 21 Apr 1994.

31. Prof. Dr. Oscar Nierstrasz.13 Born on 10 Oct 1957 in Laren, NL. Occupation: Professor in Computer Science, U Berne, Switzerland. Education: BMath U Waterloo 1979; MSc U Toronto 1981; PhD U Toronto 1984.

On 14 May 1994 when Oscar was 36, he married Angela Margiotta16, daughter of Donato Margiotta & Gina De Riccardis, in Gy (GE), CH. Born on 5 Aug 1948 in San Cesario (LE), IT.

They had one child:
	42	i.	Frederica Johanna (1989-)

Eleventh Generation 
—————————————————————————————————————————————

32. Anna Latour.11 Born on 7 Apr 1989.

33. Maria Latour.11 Born on 29 May 1991.

34. Leonora Suzanne van de Leur.11 Born on 28 Mar 1988.14

35. Laurens Robert van de Leur.11 Born on 23 Jul 1990.14

36. Sophie Lisanne van de Leur.14 Born on 9 Sep 1994.

37. Charlotte Helena van de Leur.14 Born on 9 Sep 1994.

38. Hayo Marien Ottens.10,11 Born on 1 Oct 1992.10

39. Jurjen Job Ottens.10 Born on 24 Sep 1995.

40. Michelle Lois Buijtenhuijs.10 Born on 18 Oct 1997.

41. David Matthijs Hahn.15 Born on 9 Sep 1996.

42. Frederica Johanna Nierstrasz.13 Born on 10 Jul 1989 in Pisa, IT.

Sources 

1. Do Bosscha-Hahn, Memoirs, Zeist, 1979
2. Gudrun Eisenbarth, “Lübeck Stadtbibliothek Adressbüchern,” 2001-07-16, <Gudrun@Ravenshoern.de>.
3. Louis Hahn, blueprint of family tree
4. “Nadine Pochez,” 2002-09-26, Brussels.
5. Deonisius Nierstrasz, handwritten note (2)
6. Nederland’s Patriciaat, 1924.
7. Wedding announcement
8. T.O. Duyck, <duke@quali-tech.com>, 1999-08-09.
9. CBG Newpaper clippings 25/6.
10. Chris Buijtenhuijs <c.buijtenhuijs@arbeidsbureau.nl>, 2001-07-09.
11. “Letter from Joke Sebus-Hahn,” 8-7-1994.
12. Handwritten additions to Louis Hahn’s blueprint (Joke Sebus?)
13. Oscar Nierstrasz, <oscar@nierstrasz.org>
14. Joke Hahn-Sebus, 2001-07-24, joke.sebus@inter.NL.net.
15. Gerda van Klingeren, <gvklingeren@almere.nl>, 2000-12-22.
16. Angela Margiotta, <margy@iam.unibe.ch>

Index 

Aarsse 
	Johanna	spouse of 8
Bosscha 
	Hugo	spouse of 14
Buijtenhuijs 
	Christiaan Herman (Chris)	26
	Marinus Jan	spouse of 19
	Marjoleine Henriëtte Pompea	25
	Michelle Lois	40
Engel 
	--	spouse of 1
Hahn 
	Adolph	3
	Betty	9
	Carl Heinrich Christoph	6
	Clara	10
	David Matthijs	41
	Dora (Do)	14
	Georg Johann Christoph	8
	Henriëtte Dorothea (Jetty)	19
	Henriette (Jet) Elisabeth Auguste	16
	Herman Georg Louis	18
	Johann	1
	Johann Christoph	5
	Johanna (Joke)	17
	Joris Jelle Herman	29
	Jürgen	4
	Jürgen	2
	Louis Carel Georg	20
	Louis Carel George	27
	Louis Carl Georg	15
	Mathilde	7
	Peter Paul Roelof	30
	Wijnand Matthijs	28
Harder 
	Johanna	spouse of 5
Hess 
	Metha	spouse of 4
Krellenberg 
	Dorothea	spouse of 6
Latour 
	Anna	32
	Maria	33
	Paul	spouse of 22
Lettinck 
	Sandra	spouse of 28
Lichtwark 
	Carl	13
	Gertrud	11
	Karl	spouse of 7
	Lenie	12
Mahler 
	Helena	spouse of 3
Margiotta 
	Angela	spouse of 31
Mijdendorp 
	Karin Ellen	spouse of 26
Mooij 
	Henriette (Jet)	spouse of 15
Nierstrasz 
	Deonisius (Dik) Marius	spouse of 16
	Frederica Johanna	42
	Hans	21
	Prof. Dr. Oscar	31
Ohbrich 
	Margareta	spouse of 2
Ottens 
	Hayo Marien	38
	Jurjen Job	39
	Okke Jan	spouse of 25
Schumaker 
	Barbara	spouse of 21
Sebus 
	Anna Henriette (Jet)	22
	Gerard	spouse of 17
	Gwendolyn	24
	Richard	23
van de Leur 
	Charlotte Helena	37
	Laurens Robert	35
	Leonora Suzanne	34
	Michael	spouse of 24
	Sophie Lisanne	36
van den Bos 
	Meta Maria	spouse of 21
van Klingeren 
	Gerda	spouse of 20
Wigboldus 
	Adrianne Maria (Anke)	spouse of 20