Tiemen de Groot, born circa 1844.

Tiemen was married to
Tjaltje de Vries, born circa 1866 (?).

• 1 : Jan de Groot, born in Leeuwarden on June 9, 1889, factory worker and pottebakker, died in Arnhem on May 1, 1968, aged 78 years.
  Jan was married in Leeuwarden on October 21, 1911, at the age of 22 (1) to (and divorced on May 19, 1919 from) Jetske Tigchelaar (aged 20 years), born in Midlum on August 17, 1891, daughter of Simme Gerrits Tigchelaar (worker, tileworker and workman) and Janke Wielinga (woman worker), died in Amsterdam on January 6, 1950, aged 58 years.
  Jetske was married afterwards in Amsterdam on July 6, 1938, at the age of 46 to Cornelis Hendrik Tiemeijer (aged 59 years), born in Leiden on November 16, 1878, son of Willem Frederik Tiemeijer and Christina van der Pot, plumber, watchman and factory worker, died in Amsterdam on December 26, 1959, aged 81 years. Cornelis was married before in Leeuwarden on August 23, 1913, at the age of 34 to (and divorced in Leeuwarden on July 11, 1936 from) Froukje Herrema (aged 21 years), born in Leeuwarden on October 23, 1891, daughter of Roelof Herrema (worker) and Tietje Meyer.
  Jan was married in Leeuwarden on November 13, 1920, at the age of 31 (2) to Antje Hommes (aged 40 years), born in Leeuwarden on October 1, 1880, daughter of Hendrik Hommes (antieksnijder) and Anneke Veening, died in Leeuwarden on February 8, 1947, aged 66 years.
  Antje was married before in Leeuwarden on December 10, 1904, at the age of 24 to Cornelis Snitker (aged 24 years), born in Amsterdam on October 20, 1880, son of Cornelis Snitker and Geertje de Vries, cabinetmaker, died in Leeuwarden on December 25, 1919, aged 39 years.