Looking for Marling Family and McBride Family information

My links to Columbus/Franklin County are the John Austin Marling family and William and Martha McBride. I know where all the Marlings are buried and I have all the census information about them, but I am always on the lookout for more information about them. Also, I am trying to find out what happened to my great great grandparent, William and Martha McBride after their daughter, Margaret McBride Marling died in childbirth in 1908. They seem to have disappeared off the census after 1910. It's my most frustrating "brick wall".