I don't know but will ask, when he is home from his honeymoon. The relatives and ages seem to make 1930s-40s not unreasonable.
Did you ever find any more of the one you were looking for in 2002, with the line "and the tucker bag is empty and the fish refuse to bite" in it? (I seem to recall it started "What's the use of talking when you're stony broke and walking...")