Morning, in my tidying-up peregrinations around the tree today, I have come across a possible link between Jonathan H Beaver (Beaver-3164), John's father, and Dewalt Bieber (Bieber-745) - a Jonathan Bieber of the right age appears in a census record with Dewalt/Dewald in 1850. I've added the link to that census as a research note to Jonathan's profile.
Although Dewalt's 1878 will does not mention a Jonathan (or Samuel, the other child in the 1850 record), I think this link would be worth investigating further, but it is beyond my skillset.
Familysearch has Dewald/Dewalt Bieber married twice, with his second wife, Catharine Van Reed Hunter appearing in 1850.
This is the FS person https://www.familysearch.org/tree/person/details/L7NN-4DB
and this is Dewalt's probate papers (it says 3 pages, but is actually a lot more than that, with accounting of division of the estate between the children etc.
https://www.ancestry.co.uk/discoveryui-content/view/949266:8802?tid=&pid=&queryId=1d2c7858cb7916112ce0bae16c8025ef&_phsrc=ZTC12013&_phstart=successSource
(if that doesn't work, its Dewald Bieber probate date 1878 in this record set: Pennsylvania, U.S., Wills and Probate Records, 1683-1993)
Oh, and the Beaver family sometimes used (or were mistranscribed) "Bieber" in later censuses.