Geography comes in handy for genealogical research. Your mom-in-law may have been born in the Piney Woods of East Texas, possibly Tyler County? Understandably, her spouse may have been from the same region or the nearby border towns of Louisiana. He was Lewis Nolan Scott (28 Jan 1903 - 10 Dec 1975) son of Lee Calvin Scott and Louella Galloway. Lewis' death certificate online https://familysearch.org/
with middle name spelled "Nolon". Search for Nolan Scott in 1930 Hardin-Precinct 5-District 7-Image 33 residing with older brother, Waymon. From there, simply search in reverse. I'm not related or acquainted.