Maria Naaktgeboren (1833-93) married 2 brothers in 's-Gravendeel

Maria Naaktgeboren is the eldest daughter of Jacob Naaktgeboren (1806-1878) and Lena Mol (1808-1890). She was born on 27 October 1833 in 's-Gravendeel, Holland. She had 10 younger siblings, but 2 of them died at the age of 1.

At the age of 24 - when her youngest sibling was just 4 years old - Maria Naaktgeboren was married on 29 April 1858 in 's-Gravendeel. The groom was 28-year-old flax farmer Simon Naaktgeboren. He was born on 21 May 1829 in Sandelingen-Ambacht, Holland. His parents are Jan van der Giessen (1801-1859) and Willempje van der Poel (1804-1873).
Exactly 9 months later, Maria gave birth to a son Jan on 29 January 1859 around 14:00 in Hendrik-Ido-Ambacht, Holland. That same year, on 7 October Simon van der Giessen died, aged 30. His son Jan died at the age of 5 on 14 June 1864.

On 8 March 1861 in Hendrik-Ido-Ambacht Maria Naaktgeboren, aged 27, married her brother-in-law Mattheus van der Giessen, aged 29. Mattheus was born on 29 September 1831 in Sandelingen-Ambacht as Simon's full brother. With Mattheus Maria Naaktgeboren had 9 more children named Jacob, Pieter, Willemina, Jan, Lena, Grietje Ida, Arie, Pietertje Johanna and Maria.

Nieuwe Vlaardingsche Courant, 16-11-1887

After a long illness, Mattheus van der Giessen died in Hendrik-Ido-Ambacht on 11 November 1887, aged 56. His widow Maria Naaktgeboren survived him for 6 years, and died there on 19 December 1893, aged 60.
Their younger daughter Pietertje Johanna van der Giessen, born on 10 February 1874 in Hendrik-Ido-Ambacht, married Job Laaij, and died, aged 91, on 7 August 1965 in Brielle, Holland.

Sources: WieWasWie.nl, Delpher.nl, FamilySearch.org.

Uiltje de Jong (1867-1950)

In some parts of The Netherlands some strange names were given to children. The main character of this story, for example, is Uiltje de Jong. His given name can be translated as “little owl”. He was born on 5 May 1867. His parents, Jan de Jong and Elizabeth Jansma (1835-) were living in Oudehorne, east of Heerenveen in Frisia. His grandparents are Jan de Jong, Annigjen Visser, Jan Jansma and Janke Westerterp. Janke’s father was named Uiltje, too. On 29 June 1888 in Schoterland Janke Westerterp died at the age of 90.

At the age of 39, Uiltje de Jong was married to 26-year-old Doetje Zuidersma on 24 May 1906 in Schoterland in Frisia. She was born on 4 October 1879 in Aengwirden, north of Heerenveen. Her parents are Meint Zuidersma and Antje de Jong. Amongst Doetje’s many siblings were clergyman Klaas Zuidersma (1875-1955) and carpenter Gijsbert Zuidersma (1882-1933).

Uiltje and Doetje had the following children:

1. Elisabeth was born on 7 May 1908 in Schoterland;
2. Meint was born on 1 August 1909 in Schoterland;
3. Jan.

Nieuwsblad van Friesland, Hepkema's courant, 18-7-1919

At the age of 39, Doetje Zuidersma died in July 1919 in Duurswoude, southeast of Drachten in Frisia. Her widower, Uiltje de Jong, emigrated to Canada with his sons. His daughter Eliabeth had married Hugo Koomans and was living in Hoogeveen in Drenthe in The Netherlands, and had at least two sons.
Uiltje de Jong died, aged 87, on March 12, 1954, in Sterling, Ontario, Canada, and was buried there on the 15th.

Provinciale Drentsche en Asser courant, 24-3-1954

Sources: WieWasWie.nl, Delpher.nl, GeneoFun.on.ca, Cemetery.CanadaGenWeb.org.

The family of Heiltje Adriaantje Koomans & Pieter Christian Eichholz

Heijltje Adriaantje (“Heijltje”) Koomans was born on 2 August 1816 in Willemstad, Brabant, The Netherlands, as a daughter of Nicolaas Koomans (±1753-1829) and his fourth wife Catharine ("Kaatje") Timmers (±1786-1846). She had full siblings Adriaantje Heijltje (1813-1842), Maaijke (1818-1887) and Nicolaas Koomans (1822-1869). When Heiltje was 12 years old, her father died. 

Heijltje Koomans was married on 13 January 1853 in Bergen op Zoom in Brabant to 38-year-old soldier Pieter Christian Eichholz. He was born in Bremen, Germany, as son of Margaretha Elizabeth Bohlsmann and Pieter Christian Eichholz senior, who had retired with the rank of captain and was living in 's-Hertogenbosch in Brabant.
They are the parents of

1. Peter Christian Nicolaas was born on 11 Aug. 1853 in 's-Hertogenbosch in Brabant. In 1878 in Zierikzee he married Levina Maria Bal (1854-1927). He died on 27 May 1892 in Rotterdam, aged 38. They had issue.
2. Maria Katharina Magaretha was born on 7 Dec. 1854 in Terneuzen in Zeeland. 
3. Margaretha Elisabeth was born on 28 July 1846 in Bergen op Zoom. 
4. Nicolaas Johan Willem was born on 9 Nov. 1857 in Bergen op Zoom. He died in Ermelo on 22 Apr. 1928, aged 70. 
5. Johan Arnold was born on 16 Dec. 1860 in Bergen op Zoom, and died there on 9 Mar. 1862, aged 1. 

Pieter Christian Eichholz, aged 61, died in Willemstad on 9 March 1875 around 11:00 in the morning. His youngest surviving son was 17 at the time. His widow was 58.

Their eldest daughter Maria Katharina Margaretha, aged 24, was married on 17 September 1879 in Willemstad. The groom, Dirk Johannes Middelbeek, was born in Amsterdam in the first two months of the year 1852. His parents are Catharina Johanna Wernink and Dirk Johannes Middelbeek senior who both originated in Amsterdam. 

At the age of 25, the second daughter Margaretha Elisabeth was married on 10 March 1882 in Willemstad. The groom was her brother-in-law Johan Frederik Wilhelm Sara Middelbeek. He was born in Amsterdam on 29 July 1856. 

Het nieuw van den dag, klein courant, 13-3-1882:
Margaretha Elisabeth Eicholz married Johan Frederik Wilhelm Middelbeek

5 Years of Ancestor Score with over 5000 ancestors in 2021

Inspired by the Ancestor Score  -  also called "Completeness Statistics"  -  of other blogs and GeneaNet's definition, I generated my first one in February 2016. Since then I haven't just been able to increase my score, because I also had to remove a whole line of wrong ancestors***. I could partially replace them by already existing ancestors - due to inbreeding among my ancestors. That didn't increase the score either. Therefore, I had to remove the 2017 score to be able to continue this series. 
In 2020, I was finally able to add a lot of new medieval and 16th-century ancestors, but I also had to delete some wrong 16th-century people. Luckily, the end result was a growth in ancestors. I was able to add so many ‘new’ (to me) ancestors, as a result of new publications on HoGenDa.nl, and time saving by the staying-at-home in 2020 due to the Covid-19 virus. Therefore, I've decided to publish this year's score on New Year's Day.

Geneanet defines the Ancestor Score as 

“comparing the number of possible ancestors with the number of identified ancestors on a 10-generation report”.

My Ancestor Score at generation 10 in the period 1600-1740 is 79.7%, because some cousins intermarried in the 7th generation.
Tracing a person's lineage back in time forms a binary tree of 2 parents, 4 grandparents, 8 great-grandparents and so on. However, the number of individuals in such an ancestor tree grows exponentially and will eventually become impossibly high. For example, an individual human alive today would - over 30 generations, going back to about the High Middle Ages - have about 1.07 billion ancestors, more than the total world population at that time. 
In reality, an ancestor tree is not a binary tree. Rather, pedigree collapse changes the binary tree to a directed acyclic graph (d.a.g.) with a vertex for each family member and an edge for each parent-child relationship.