Christian's wife was never married to Jacob. But, for a while, Christian appears to have been giving the census takers his name as Jacob (on several, you can see two Jacob's listed. I have no idea why he'd do this except maybe there is a grain of truth to the old Bixel story about why Christian left Switzerland in the first place.
My dad & I went to central Pa. two years ago to see Bixel's that still live there, and we visited Christian's old farm. All of it is still there, preserved as a land conservancy...all buildings are long gone, firstname.lastname@example.org