┌── Jan Berends Bierling (Date unknown - Sunday 09 September 1860 Winsum, Baarderadeel, Friesland, Nederland)
┌── Geert Bierling(Thursday 23 November 1843 Klein Garnwerd, Ezinge, Groningen, Nederland - Saturday 26 May 1917 Obergum,
│   Winsum, Groningen, Nederland)
│ └── Trijntje Pieters Kars (Date unknown - Thursday 25 July 1861 Winsum, Baarderadeel, Friesland, Nederland)
┌── Jacobus Bierling(Thursday 19 February 1880 Obergum, Winsum, Groningen, Nederland - Monday 25 October 1954 Groningen,
│   Groningen, Nederland)
│ └── Lammechien Meisner(Tuesday 14 July 1840 Rasquert, Baflo, Groningen, Nederland - Friday 09 May 1930 Obergum, Winsum,
│   Groningen, Nederland)
│ └── Janna Kortholt(Sunday 30 August 1812 Middelbert, Noorddijk, Groningen, Nederland - Friday 19 June 1857 Rasquert,
│   Baflo, Groningen, Nederland)
│ └── Trientje Jans van der Veen(1785 Harkstede, Slochteren, Groningen, Nederland - Wednesday 01 January 1851
│   Middelbert, Noorddijk, Groningen, Nederland)
Afina Bierling (Thursday 18 May 1905 Winsum, Groningen, Nederland - Date unknown)
└── Anna Jacoba Stumpe (Tuesday 22 March 1881 Groningen, Groningen, Nederland - Date unknown)
│ ┌── Joannis Jacobs Boelens(1777 Den Ham, Aduard, Groningen, Nederland - Monday 08 December 1862 Aduard,
│ │   Groningen, Nederland)
=>
│ ┌── Jacobus Joannes Boelens(1810 Aduard, Groningen, Nederland - Thursday 10 April 1879 Groningen, Groningen,
│ │   Nederland)
└── Theodora Nicolai Smit(Wednesday 14 November 1832 Hoogezand, Groningen, Nederland - Sunday 28 August 1892 Groningen,
  Groningen, Nederland)
└── Aafke Derks van Oosten(1800 Bedum, Groningen, Nederland - Wednesday 04 October 1843 Hoogezand, Groningen,
  Nederland)
=>
20 21 4 .
4 .