During the time of Tryntje Sybolts 2nd marriage to Jan Hulst, a son was born: Sibolt Jans, born on 8 Aug 1777 in the city of Groningen. 

Sibolt Jans died 25 Oct 1816 in Groningen: he was 39 years old, according to the Overlijdensregister Groningen 1816
Aktenummer 591.  Mentioned in the register is Sibolt's wife, Lammegien Breedveld. 

Sibolt Jans and Lammegien Breedveld were married on 6 May 1809 at Groningen.  Lammegien was the widow of Berend Wybolts. 

This union produced a daughter, Catharina Jans, born 11 Jan 1811 at Groningen.  She was baptized Catholic (Kerkeboek Groningen 1795-1811
Collectie DTB (toegang 124) Inventarisnummer 637 (Rooms-katholiek).

This union produced a second daughter, Jurriana Jans, who died at 19 months on 23 Nov 1816, also in Groningen (Overlijdensregister Groningen 1816 Aktenummer 720).