The Willey's can get extremely frustrating what with so many of the same names. I'm going to sit down tonight and go through a lot of my things and hopefully get somewhere. Now its bugging me not knowing exactly which John F. goes where.
I did come across another John F., who is the son of William and Nancy Willey. It states that he went to Hancock County Illinois with his two brothers Isaac and Wilson. I noticed that you mentioned the name Issac before maybe thats a hint? I'll dig through some of my notes and see what I can find. As of right now I do not have a spouse or children for John F. Willey's son John F.

I hope that makes sense.

Rachel