Did you ever find out more about Roy Vernon Shadbolt? His DOB is 1 aug 1895 on his WWI draft card and 1 Aug 1890 on his WWII draft card. As near as I can find out, Arthur Shadbolt had 2 wives, the first Minnie, he abandoned to marry Lucy (?Roy's mother?)in 1895. I believe Roy and Mary were married in 1911 but have not confirmed that yet. If so, the 1895 birthdate is probably too young for him.
Another confusing fact is the birthdate on Roy's headstone: 1 Aug 1890; yet also on his headstone, it clearly says he fought in WWI which would have made him about 27 at the time.
Very frustrating!!! Any help is much appreciated!