We have a Peter Krotzer, brother of William H. Krotzer (Penn.). Peter was married to Victorine Neild, had a son Albert about 1871 (Minn.). Rumor is, Peter and "Viccie" divorced. Is it possible (a) they are the same Peter, or (b) Peter remarried, had a son Andrew?? You give no dates, so this is speculation. Our records (from different sources) show Kratzer and Krotzer used for the same people, so both spellings may have been used.