I have received a very interesting article in Familia 1965 by Dr. AH Jonker. In there it is definetaly stated that Adolph Jonker was not the child of Jonker van Magascar. He was not born out of wedlock and not a child of slaves.
I am going to unlink him from the parents as not to be said I am being milingent again. Hoop dit is reggespel. Read the full article in the sources. Unfortunately it is again in Afrikaans so if anybody feels like translating it you are welcome.
It was brought under my attention by another user and they immediately send me the correct information. I am thus going to lock the profile til a better sources article can be proved this wrong.