This may be a longshot but in the 1930 census there are two families living at 316 Mesa SE. Coincidentally one family is from Louisville, Ky. (Robert S Strader 1895).
Do you think its possible that there were two families living there in 1940 and some how when the census was taken they became intermixed? Maybe no adults were around and whoever the census taker talked to confused the information?
I know its a kinda stretch, but who knows??