As to the second child, Cornelis:
He was born on 29 Nov 1897 at 07.00 hrs.
Apparantly dad Gerrit went to declare his birth at the civil registry as soon as possible, that same morning. Cornelis died only 4 hours after he was born, at 11.00 hrs, so when dad Gerrit came home, his son had already died or was dying.... Can you imagine that? He declared the death the next morning.