Thanks, Clifford, for your reply on Jonas Newhall. It appears that the Jonas born in 1749 could not have been my ancestor, for he died without issue.
So now I wonder.....who was the Jonas who lived in Brookfield in 1790 with two children, a son and a daughter? Could he have moved to Brookfield from Lynn or Malden? This Jonas is the only one I have been able to find in the 1790 census of MA, CT, NH, VT. There were several others named Jonas, but they were all born later. My Jonas supposedly moved to Windsor Co. VT where his dau Rachel married. Probably Jonas died in VT.?