There is a Cleveland Dowler year of birth 1888 listed in Slate, Wood County, WV in both the 1900 and 1910 census. The 1900 census lists his month of birth as April which does not match your date. In the 1900 census he is listed as the son of David E. and Rebecca Dowler with siblings David, Mary, Arthur, Nettie, Ottie (?) daughter and Rebecca. The parents and most of the children were born in Ohio. Cleveland is listed as born in WV. In the 1910 census he listed as William C. and is married. His wife's name is Georgia and they have a son Herbert. They are listed on the same census page as David and Rebecca Dowler who now have two additional children Andrew and Pearl. I don't know if this is the William you are inquiring about. Edna