I too am searching for John William Turner. Charlotte was my grandmother and Cromwell is my father's middle name. Sadie's (or Sarah Ann) maiden name was Mellott. Her parents were Sampson J. and Rebecca.
Unfortunately, the John W. Turner that married Martha Burgess does not appear to be our great grandfather. He is found in the early 1900's, a widower, living with his daughter.
I'd love to chat more about various information we may have.