I recommend that you request a grave marker photo through the memorials for William and Martha. It looks like you are the owner of the memorials. Just click on the request a photo icon and a request will be sent to volunteers who live near the cemetery.
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=89...http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=89...