Find A Grave contributor Denise Drake Horton (#47089329) has questioned the validity of John's birth date since his younger brother was born in January 1910.
The following information was contributed by a Find A Grave visitor firstname.lastname@example.org.... The death certificate info that was transcribed from microfilm by the LDS for John William Hadley says he was b. abt 1909, d. 10 Mar 1932, age 23. Parents: Luke Hadley and Carrie FOSTER. I believe that Luke Hadley was married to Carrie C. Foster; Carrie Bell Lucas; and Dora Lee Hall. I have John William's birth date as 1 Sep 1908.