Frits Klazes de Vries, born circa 1785 (?), merchant.

Frits was married to
Hendrikje Johannes, born circa 1789 (?).

• 1 : Johanneske Fritzes de Vries, born in Grouw on August 29, 1812, died in Harlingen on January 28, 1863, aged 50 years.
  Johanneske was married in Idaarderadeel on May 2, 1835, at the age of 22 to Wybe Hilles Feenstra (aged 22 years), born in Leeuwarden on August 1, 1812, christened there on September 2, 1812, son of Hille Wybes Feenstra and Titia van der Veen, died in Harlingen on June 25, 1876, aged 63 years.