Stark's related to McDowell,Schwetzke

Anyone with relatives to a Stark that has ancestors by the name of Schwetzke or McDowell, Please e-mail me I am trying to trace my roots past my Grandparents.
My Grandfathers name was Frank Stark, My Grandmothers name was Elsie Schwetzke. Both of them lived in the Chicago, IL. area. They had 5 children, Donald, Lester, Robert, Ronald and Nancy(Munnfield). Any leads would be Greatly Apreciated.