He is married to Antje Sieverens Wiersma.
They got married in the year 1770 at Dokkum, Friesl., he was 34 years old.
Child(ren):
gepensioneerd wachtmeester
https://www.familysearch.org/search/record/results?count=20&query=%2Bgivenname%3Acoenraad~%20%2Bsurname%3Aseibel~
https://www.geldersarchief.nl/bronnen/personen?mistart=0&mivast=37&mizig=128&miadt=37&milang=nl&misort=dt%7Casc&miview=tbl&mip2=seibel
The data shown has no sources.