Really no problem to connect their son Carrie, and since there were no sources whatsoever for his parents, I have been looking for sources for him and his now supposed parents, found a couple in Harderwijk that baptized some children, father named Stephen Cornelis and (or but) mother Bette Peters, they baptized a son Cornelis who's patronymic very likely would have been Stephensz. so it might be our Cornelis. But because of the last name looked for Mullers or Mulders also of course and there were quite a few in Gelderland, but no luck so far with finding children named Cornelis with a father or mother named Mulller. Added the ones (baptisms) I could find to his fathers profile.