Intriguing. I hadn't known about the marriage breaking down. Fridenrick is an interesting possible alternative rendering of the name. I really appreciate your looking into this - anything you can find is of help. So could this other person be a cousin or something, if they are giving their father's name as Peter, not John?
Does the name suggest any particular country / place of origin? I have certain things I'm hoping to find, but have now got to the point I want to know, even if I am disappointed!
Thank you!
M