This isn't going to be much help, I'm afraid, but I thought I'd let you be the judge of that.My Hindrik Kuiper was married sometime before July 1781 in Bellingwold, province of Groningen (?) in the Netherlands, not the province of Friesland.His son was Jan Hindriks Kuiper, who married Ilmtje Pijnakker and became the father of Hindrik Jans Kuiper, b. 7-15-1781 in Bellingwolde.
Hindrik Jans Kuiper married Taalke Jans Roelfsema 5-15-1808 in Bellingwolde.
If this becomes of help to you, please let me know at email@example.com. maggie