genealogy.com has quite a bit on Jacob Constant and his family. There seems to be much in the book "History of the Early Settlers of Sangamon County, Illinois" on his family. I might be able to help you end of next week with quotes from this book if no one else can do it. Ella in Michigan My Illinois families McFarland and McIntyre, St. Clair and Bloomington 1830 - 1900.