I'm not sure I follow you. I saw the William J Diers who lived on Flower St but he was born in 1917, wrong year to be the WJ Junior in the 1940 census.
I did some checking on Ruby, "your" Williams wife. From her obit her mother was Cordelia B Priest. I can "track" Cordelia through the census up until 1940 when she cannot be found. Maybe where ever she was Ruby and the children were with her.
Interesting fact though, Ruby's brother Jesse Eugene Priest is found in the 1940 census living in Albuquerque, Guess what his occupation is??????? Typewriter Salesman,,, hahah.
Not that that fact helps us but pretty strange.