Sybren Sipkes Sleeper, born circa 1801 (?).

Sybren was married to
Aaltje Wiegers Mossel, born circa 1805 (?).

• 1 : Willemke Sybrens Sleeper, born in Harlingen on November 17, 1828, died there on June 16, 1912, aged 83 years.
  Willemke was married on May 5, 1853, at the age of 24 to Johannes Innes Wijga (aged 22 years), born in Harlingen on February 22, 1831, son of Inne Wijga and Trijntje Wielsma, died on June 19, 1897, aged 66 years.