Johan Simon Alexander Broertjes (1839-1903) was an illegitimate son

Johannes Simon Alexander Broertjes was born in on 8 August 1839 in The Hague as illegitimate son of cleaning woman IJda Holderman. His surname was changed from Holderman to Broertjes when 44-year-old IJda Holderman married 33-year-old Pieter Broertjes in The Hague on 6 March 1850. At the marriage ceremony the couple acknowledged 10-year-old Johannes Simon Alexander as their son. Until recently, however, Pieter Broertjes had been living in Alkmaar, so it's very unlikely that he was the boy's biological father.
Earlier, IJda Holderman had given birth to another son (in 1845) and a daughter (in 1836), but they had both died as babies. IJda's parents are Pieter Holderman and Alijda Sikkes. IJda died on 23 January 1882 around 20:00 at the age of 76. At the age of 73, Pieter Broertjes died in The Hague around 6:30 A.M. on 14 February 1890. His parents are Gerrit Broertjes and Neeltje Nol.

Johannes Simon Alexander Broertjes and his first wife had a surviving son

Johannes Theodorus Broertjes was born in Rotterdam on 25 May 1874 as the only surviving child of Johannes Simon Alexander Broertjes and his wife Josina Catharina Blekxstoon (a descendant of the Blackstone family in Dordrecht). Josina Catharina Blekxstoon was born on 27 August 1838 in Rotterdam, and died there on 6 May 1893. Her parents are Maria Elixabeth Hek and Johannes Blekxstoon , who is a son of Josina Wielandse and Johannes Adrianus Blekxstoon.
At the age of 34, Johan Simon Alexander Broertjes had married 35-year-old Josina Catharina Blekxstoon on 27 August 1873 in Rotterdam. Josina Catharina died on 6 May 1893 in Rotterdam, aged 54.

Johannes Simon Alexander Broertjes, widower of Josina Catharina Blekxtoon, married Carolina de Knoop

On 2 August 1893 in Rotterdam widower Johan Simon Alexandermarried his second wife, 39-year-old Carolina de Knoop (1854-1931). At the time his son Johannes Theodorus was 19 years old. In his father's opinion, Johannes Theodorus was a spendthrift, as the advertisement below shows: “WARNING. Please do not give MONEY or GOODS to my under-age son J.Th. Broertjes, as I will not PAY for it.”

Rotterdamsch Nieuwsblad (newspaper), 14-4-1894

With his second wife Johan Simon Alexander Broertjes had an additional son, Andries, who died as a baby. Their daughter Johanna Maria Broertjes was born on 15 July 1895 in Rotterdam. Johannes Simon Alexander Broertjes died in Rotterdam on 9-12-1903 at the age of 64. His only surving daughter Johanna Maria was to married Matthijs van den Berg in 1918, but died on 25 October 1920 at the age of 25. She left behind a daughter named Macheltje van den Berg.

At the age of 28, on 28 May 1902 in Rotterdam, Johannes Theodorus Broertjes married Johanna ten Westenend. She was born on 27 Septeber 1873 in Nijmegen. Her parents are Anna Kuiten and coachman Petrus ten Westenend. Johanna and Johannes Theodorus had children named Johannes Simon Alexander, Johanna Josina and Johannes Franciscus.
Johannes Theodorus Broertjes died on 16 November 1953 in Renkum, aged 79. His widow, Johanna ten Westenend, died in Zaandam on 13 May 1964.

Arnhemsche Courant (newspaper), 22-5-1947

Sources: WieWasWie.nl, Delpher.nl, HaagsGemeenteArchief.nl, Archief.Zaanstad.nl, StadsArchief.Rotterdam.nl.
For additional information, see also: StamboomDeKnoop.nl.