I did a little digging and here is what I have found:
1930: Alice Hammons 1930 census, King county, Washington, single, born in OK
1940 census, Los Angeles, Los Angeles county, California, single, born in OK, 1935 lived in King co., WA, secretery
1930: Robert Kenneth Hammons, or Kenneth Robert Hammons, single, born 1911, Montana, 1930 census Portland, Multnomah, Oregon with father, Joseph W Hammons, Widowed., lodger, Real Estate. Kenneth/Robert's father's birthplace Illinois, mother's birthplace, Kansas. Joseph's father's bp IL, mother's bp IL. (matches info on 1910 census)
1940 census: Robert K Hammons, born 1911 in Montana, single, living in Teton, Wyoming as a hired hand.
1940 census: Joseph W Hammons, Portland, Multnomah, Oregon, born in Illinois 1881, Real Estate Broker, married to Helen A Hammons, born in Nebraska 1890. Also in household is Donald Smith, grandson, born in 1926 in California. Donald Smith is in 1930 census in same town with parents Raymond C and Helen M Smith. Helen M and Helen A same person? Age matches up to both of them. Maybe he is Joseph's step son instead of grandson.
Joseph W. Hammons born Feb 9, 1881, d. Jun 1969, Green Crest Memorial Park Cemetery, Sheridan, Yamhill, Oregon. Find A Grave Memorial# 18672115
There is a Robert K. Hammons b. Mar 29, 1911, d. Jul 30, 1988, buried in Eagle Point National Cemetery, Eagle Point, Jackson County, Oregon. Plot: A, 1694-a Find A Grave Memorial# 3889808
I haven't found anything yet as to where Lora is buried. They seem to move around a lot. Montana, Oregon, Washington.