I am very familiar with the Lewis' in Douglas County, Illinois as they are from my father's family.I have visited the Arcola area several times and taken photographs of the grave sites of my family there.
I have some information that would help you in your search if you are interested.Currently I am putting together a family history book of the Lewis' and am trying to put all the "pieces into place" from the Roy Dimond Lewis generation.
Have you had any luck with searching prior to this family?I can take the Lewis' back two generations before Roy Dimond, when they entered the U.S. (Michigan) in 1849/1850.Prior to that, the Lewis' lived in Ontario, Canada.
Other than that, I am stumped.I have never been able to find any descendents of that first family.Figuring that the families of the early to mid-1800's typically had three or more children, I thought that it would be easy to find some descendents that would have solid, traceable info on the Lewis' - - - but no hits yet.
Feel free to contact me on either of the following e-mail addresses and I can provide you with what I know of the Lewis' that lived in Illinois -