Responses
He was led to believe that the daughter was still-born and died at birth by the mistress who is a doctor I believe. So the ex-friend and mistress and him schemes to have their kid replace the "dead" child since the child is "dead" anyways.
The stories about the daughters death amd the fake is mixed with the father. How can he tbink his daughter is dead when he's raising Katherine amd not know? A mistake was made in this story.