Jetse Sibbeles died 8-6-1816 according to her death record, as widof from Bernardus Spouwdouw (the name was written in several ways),
at age of 86 yrs. She died in Haske (or Nijehaske) falling under Haskerland.
so born about 1730. Birthplace and parents not mentioned.
From the church member registration;
Lidmatenboek Schoterland, 1774
Man: Bernardus Spandauw
Vrouw: Jetske Sibles
Woonplaats (place of living): Oudeschoot
- Op 3 december 1774 ingekomen (coming from) van AEngwirden
Lidmatenboek Schoterland, 1757
Man: Bernardus Spandauw
Vrouw: Jetske Sibbeles
- Op 20 februari 1757 ingekomen van De Knijpe
- Op 18 december 1764 vertrokken naar De Knijpe
So they came in Schoterland from the Knijpe an went back to the Knijpe in dec.1764
still looking for their marriage,
it seems that the father of Bernardus , (Roelof Spandau) came from Groningen,
see
www.allegroningers.nlbut I don't know how far back you search, or that you're only interested in Sibbele and his parents.
Jettie