Children:
- Thomas Klaassens was born in 1725 in Siddeburen, Slochteren, Groningen, Nederland; was christened on 05 October 1725 in Siddeburen, Slochteren, Groningen, Nederland; died in Date unknown.
- 1. Thomas Klaassens was born in 1726 in Beerta, Groningen, Nederland; was christened on 13 October 1726 in Beerta, Groningen, Nederland; died in Date unknown.
- Meerten Klaassens was born in 1729 in Beerta, Groningen, Nederland; was christened on 19 June 1729 in Beerta, Groningen, Nederland; died in Date unknown.
- Jan Klaassens was born in 1729 in Beerta, Groningen, Nederland; was christened on 19 June 1729 in Beerta, Groningen, Nederland; died in Date unknown.
- Jan Klaassens Mulder was born in 1731 in Siddeburen, Slochteren, Groningen, Nederland; was christened on 11 March 1731 in Siddeburen, Slochteren, Groningen, Nederland; died in Date unknown.
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