No problem Jan, we all make mistakes, to rectified the mistakes, maybe it's best to leave it temporarily as is. Until their is concrete proof.
I'm also not sure of the link of Pieter Martinus Cordier to the parents? His death notice don't give the parents names, thats a problem.
Put Pieter Marthinus Cordier under review, or lock the profile until concrete proof is found? Sorry that's my advice.