I could not find anything about Edward in The History of Racine and Kenosha Counties. There is a Mitchell family there and they belonged to the Baptist Church. Mr H Mitchell was from Scotland and came to live in Racine in 1855. I know that he is not Edward's father but he could possibly be his grandfather. Mr Mitchell's sons were William H, Henry G., and Frank L. You may also want to check the newspapers of which there were quite a few.