I'll look tonight to see if Permillia's family moved to PA and if so when. I will also make sure I didn't miss anything when I transcribed Rex's book into Family Tree Maker.
I think your right though, that we are looking at two different Horace Preston's. Even looking at Permillia as being his second wife is stretching it since there would be 20 to 30 years difference in their ages. but you never know, stranger things have happened.