I hope the info I posted will help a little. As I said, really nothing is written on your William H, but there IS some information on his grandfather William. I'd be glad to copy and snail mail you what I have if you're interested in earlier generations. You can email me, email@example.com if you are interested in what there is.
As the letter I posted from Anna was written in 1862, they had already been 'in the west' for 9 yrs or so. There are/were many Van Scivers in the Beverly NJ area, and I grew up within walking distance of the area.Kim