Neil, I am so glad to hear from you!I am certain that Bill Presfield was married to Loduska Marie Smith in Pawnee Oklahoma.They were married on 6 March 1932.Edna Louise Presfield, their daughter, was born in January 1933 in Pawnee.They divorced shortly thereafter.It was a very short marriage, and Marie was only 16 when she got pregnant with Louise.
Louise is still alive, she lives in Fruita Colorado.She says she has memories of her dad driving up in a car with other children (when she was abt 5-8 yrs old) in the car and asking to see her, but her grandmother wouldn't let him see her. I know she is very curious about the Presfields, where she knew nothing, and her mom discouraged her from asking.I have encouraged Louise to contact your dad, but she is reluctant because she didn't think they knew she existed.
I know this must be a big surprise for you and your family.I have something similar happen in my family, but now am very close to the children of my dad's 1/2 brothers. If you would like, I can provide you with the address and phone number for Louise, or you may be able to find it by just googling. I know she would love to learn more about Bill Presfield, it has always been a big question mark, and she never knew him at all.
My connection to all of this, is Loduska Marie Smith was a 1/2 brother to my grandfather.(Of course that I didn't know about either-so I can understand your amazement) I am sure there are more family mysteries to uncover.You never know what you will find!