No, I'll send a message. But I'm no expert on Thurbers, so I won't have much to contribute here. Since the James profile has been around even longer than the John profile, I'm surprised it wasn't cleaned up long ago. I don't know how you clean up -- just disconnect the father and then completely repurpose it as a new "Thurber" profile?
The unsourced template is there AFAIK only because the birthplace is listed, while there is controversy over whether this birthplace is correct.