Claim: On the 24th of July 1635, Theodoor van Thulden married Maria van Balen, and they had one child, a daughter named Maria Anna.
Evidence: In 1635 van Thulden returned to Antwerp where on 24 July 1635 he married Maria van Balen, daughter of the prominent Antwerp painter Hendrick van Balen the Elder (1575-1632) and sister of the painters Hendrick the Younger and Jan van Balen. Theodoor and Maria had one child, a daughter named Maria Anna, who was baptized in Antwerp on 7 May 1636 and died between 1652 and 1669.