On the GenLias-site (www.genlias.nl
, free registration) I found the marriage of two children of Jacob and Elizabeth.
1. wedding in Oude Pekela (Groningen), act 37, Aug. 13, 1912
Husband: Tjeerd Dijkstra, 28 yr, born Kantens (Groningen)
son of Jacob Dijkstra and Elizabeth Doornbos
Wife: Aaltje Bloem, 24 yr, born Oude Pekela (Groningen)
daughter of Pieter Bloem and Anna Kuilman
2. wedding in Baflo (Groningen), act 22, Nov. 23, 1916
Husband: Engel Oost, 40 yr, born Norg (Drente)
son of hendrik Oost and Antje de Jong
Wife: Trijntje Dijkstra, 25 yr, born Kantens (Groningen)
daughter of Jacob Dijkstra and Alizabeth Doornbos
Trijntje already had a child
The wedding-acts of Kantens, where Jacob and Elizabeth probably married, are not yet available on GenLias. I suppose you can find them there within a few months, information is added regularly.