witness is Willemina van der Beij (grandmother)
https://www.familysearch.org/ark:/61903/3:1:3QS7-L9QJ-1QF2?i=394
https://samh.nl/bronnen/genealogie/deeds/00af035c-e349-f629-1208-9bc9003ac25e
He is married to Maria Kalkoven.
Permission for the marriage has been obtained in Gouda (ZH) on August 10, 1777.Source 3
They were married in church on August 24, 1777 at Moordrecht (ZH), he was 34 years old.Source 4banns: https://www.familysearch.org/ark:/61903/3:1:3QSQ-G9QV-SZ4K?i=84
marriage: https://www.familysearch.org/ark:/61903/3:1:3QS7-89QJ-Y9M5-B?i=353
Child(ren):
he was a medical doctor in Moordrecht (ZH)