LaCretia, I have added a profile for Willis so information can be collected in one place.
Also, I have found the marriage record for Willis and Ethel Wellington in Des Moines, Iowa, in 1932. If this is the correct marriage, it shows his parents as Truman Butts and Alberta Keys. This makes sense, as Alberta is buried in the same cemetery. Also, Ethel Berger is shown on the 1930 US Census with a brother and several sisters immediately below the enumeration for the Charles Thompson family, and a C.H. Thompson was one of the witnesses to Ethel and Willis's marriage. Ethel's maiden name appears to have been Berger, but she may have been married to a Wellington before she married Willis.
So, the question is, what is the source of the information that Willis's parents were Jeff and Sara?