Jan Beertsen, born circa 1595, died before 1648, aged at most 53 years.

Jan was married in Oldebroek on September 24, 1619, at the age of approximately 24 to
Lubbe Beerts (aged approximately 19 years), born circa 1600, died in the year 1684, aged approximately 84 years.

• 1 : Beert Janssen, kerkmeester and gildemeester van het "Lieve Vrouwegilde", born in Oldebroek circa 1635, died circa June 1, 1692, aged approximately 57 years.
  Beert was married (1) to Merrichjen Dircksz, died before November 29, 1666, daughter of Dirck Francksen and Merrichjen Gerrits.
  Beert was married in the year 1667 or 1668, at the age of 32 to 33 (2) to Bartjen Garrits, died before April 1, 1681.
  

• 2 : Michiel Jansz.
  Michiel was married in Oldebroek on April 16, 1681 to Lubbertje Aerts.
  

• 3 : Stijne Jansen.
  Stijne was married to Gerrit Andriessen.
  

• 4 : Frank Jansen.
  

• 5 : Fenneken Jansz.
  Fenneken was married to Beert Jansen.
  

• 6 : Gerrit Jansz.
  Gerrit was married to Betjen Gerrits.