I see that this post is a couple of years old, but felt that I will respond. I have done some research in Wisconsin and have a little information on Jacob. There doesn't seem to be much to find on him and his wife. I have David's will, and he had 5 children by his first wife, Hannah. Two died in infancy, and the three living children were, Jacob, Abraham(who never married and had a guardian) and Nellie(who died in the early 1890s- and I believe it could have been in childbirth). Then David had 5 children by his second wife, Martha. If I can help out, I will be glad to.