Peter Tag (Tagg?)

Searching for more information on Peter Tag. I believe it is Tag not Tagg. He was born around 1840 in Germany. His wifes name was Magdelene Ruetner. He had 6 children i believe, named Cora, Nellie, Geo, Ida, Amanda, and Olga. Cora A Tag was my great grandmother. Cora married William F. Herrmann. Any info will be greatly appreciated....thanks in advance