Hi Krealyn,
I haven't researched this personally, but John William Slavens should be a son of Daniel and Milia (Spencer) Slavens. He was born in Montgomery Co., KY, spent much of his life in Putnam Co., IN, although he lived in Wayne Co. IA for several years. Daniel was a son of Isaiah and Barbara (Perks Leaton) Slavens and grandson of John and Elizabeth (Stuart) Slaven; you'll find a lot about Isaiah and John online...