Sijke de Vries, born circa 1852 (?), died before May 26, 1904, aged at most 52 years.

Sijke was married to
Jelle de Vries, born circa 1848, died before May 26, 1904, aged at most 56 years.

• 1 : Klaas de Vries, born in Franeker on December 15, 1875, pilot's apprentice.
  Klaas was married in Harlingen on May 26, 1904, at the age of 28 to Ymkje Reinhart (aged 23 years), born in Harlingen on December 11, 1880, daughter of Hendrikus Reinhart (warehouseman, workman and dock hand) and Johanna Brouwer.