According to the Social Security Death Index, William, Mattie and Sterling all died in California. William Ludewell4/12/1886 til June 1973 in Modesto, Stanislaus, CA Mattie Ludewell2/2/1891 til August 1974 in same place Sterling Ludewell10.7.1909 til 5/13/1991
In the WWI Draft Registration Cards is William Wesley Ludewell born 4/12/1888 living with wife and child in Lindsey, Ok and registered in Grady county.
There is also a Gladys Ludewell Gaines, 80, that died in Chickasha, Grady county, Oklahoma on 9/7/1990.
Their are two Ludwell's buried in the Alex Cemetery in Grady county.It can be viewed on the OKGENWEB site in the Grady county under cemeteries.