This bug appears to be still there.
I'm adding a second wife to a man with a first wife and five children, all correctly attributed to the first wife.
By coincidence, both wives are Catherine, and I have set a rejected match between them.
But then I see this:
If Maria O'Rourke is a child of Catherine, you will need to replace Maria's current father separately.
If Winifred Mary O'Rourke is a child of Catherine, you will need to replace Winifred's current father separately.
If Patrick Rourke is a child of Catherine, you will need to replace Patrick's current father separately.
If Thomas O'Rourke is a child of Catherine, you will need to replace Thomas's current father separately.
If John (O'Rourke) Rourke is a child of Catherine, you will need to replace John's current father separately
Clearly it is the MOTHER, not the father, that might have to be replaced if the child was from the second marriage of the father.
Is it even necessary to prompt for a check of the mother?