Maria Elisabeth Koster, born in Harlingen on July 13, 1885, daughter of Jan Koster (painter's man) and Elisabeth van der Wijk.

Maria was married in Harlingen on May 14, 1906, at the age of 20 (1) to
Gerard van Dijk (aged approximately 23 years), born circa 1883, died in Menaldumadeel on March 12, 1917, aged approximately 34 years.

• 1 : Bernardus van Dijk, born in Harlingen on September 1, 1906, casual labourer.
  Bernardus was married on July 20, 1933, at the age of 26 to N.N..
  

Maria was married in Harlingen on February 28, 1918, at the age of 32 (2) to
Jacob Smits (aged 29 years), born in Harlingen on February 5, 1889, son of Bouwe Smits (barge hand) and Hilligje Jacobs Knol (daily help), died in Harlingen on January 30, 1939, aged 49 years.
Jacob was married before in Harlingen on October 20, 1910, at the age of 21 to Jeltje Baarda (aged 18 years), born in Harlingen on March 9, 1892, daughter of Rimmert Baarda (workman, tileworker and casual labourer) and Jitske de Bruin, died in Harlingen on March 3, 1916, aged 23 years.