Petronella Folkertsma, born in Oosthem on April 12, 1811, died in Arnhem on March 14, 1887, aged 75 years.

Petronella was married in Leeuwarden on March 9, 1836, at the age of 24 to
Frederik August Stoett (aged 24 years), born in Leeuwarden on March 15, 1811, opzichter der eerste klasse bij den waterstaat and architect, died in Zuidhorn on September 28, 1885, aged 74 years.

• 1 : Elisabeth Sophia Stoett, born in Leeuwarden on April 13, 1842.
  Elisabeth was married in Leeuwarden on August 31, 1875, at the age of 33 (1) to Wiebe Klazes Feenstra (aged 31 years), born in Heerenveen on July 13, 1844, son of Klaas Wybes Feenstra (castellan and innkeeper) and Aaltje Ulbes Heeringa, shop assistant, castellan and innkeeper, died in Heerenveen on July 15, 1880, aged 36 years.
  Elisabeth was married in Schoterland on December 28, 1882, at the age of 40 (2) to her brother in law Bernardus Clerk (aged 38 years), born in Leeuwarden on May 2, 1844, son of Pieter Clerk and Geltje Bruining, saddler.
  Bernardus was married before on May 17, 1872, at the age of 28 to Jitske Klazes Feenstra (aged 24 years), born in Heerenveen on April 10, 1848, daughter of Klaas Wybes Feenstra (castellan and innkeeper) and Aaltje Ulbes Heeringa, died in Heerenveen on February 27, 1882, aged 33 years.