The only grandchildren of Henken-Dirksen I had listed in the family were:
and (with your information) Doortje Henken.
Great grandchildren of Henken-Dirksen that I have listed are children of Helbert Henken x Marrigje 'Maria' Doornenbal:
1. Johannis Jan Henken (B. 21 Apr 1782 in Amsterdam; D. 25 May 1851 in Rhenen, Utrecht, Netherlands; Married to Aaltje (Hendrikje) van der Meijden (B. 03 Mar 1782 in Veenendaal, Utrecht); Johannis & Aaltje have 6 children (I can submit names if you wish)
2. Maria Sophia Henken (B. 09 May 1784; D. 04 Oct 1859 in Rhenen, Utrecht, Netherlands; Married to Teunis van Dijk); so far, I have only 1 daughter listed of Maria & Teunis: Marrigje van Dijk (B. 07 Feb 1817 in Rhenen, Utrecht.