Theunis married Marrigje Pieters de Graaf, daughter of Pieter de Graaf and ? ?.160 (Marrigje Pieters de Graaf was born circa 1680.)
Theunis also married Pietertje Cents on 26 July 1711 in Lexmond.160

Spouses/Children:
1. Marrigje Pieters de Graaf
• Annigje Theunisdr de Jong
• Grietje Theunisdr de Jong
• Pieter Theunisz de Jong
• Hendrik Theunisz de Jong
• Johannes Theunisz de Jong
• Neeltje Theunisdr de Jong
2. Pietertje Cents
• Marrigje Theunisdr de Jong