Re: James Davison (- bef 1850) and Mary Ellis (c.1806) Washington Co., TN
Richard, I do not have the answer for you but do have a couple of suggestions.
First, do not get sidetracked by the spelling. The surname has 3 common variations - Davison, Davidson, Davisson. The first 2 are used interchangeably in records. Spelling was not sacred. My own line was generally spelled Davison in the latter part of the 1700s in SWVA but it gradually changed to Davidson over time.
Next, the probate records for Washington County, Tennessee, have been digitized and uploaded for free access at Familysearch.com. You might find some answers in these records. You have a number of associated surnames so you should pay attention to those also. I would read the entire volumes for the years in which you are searching. Just go to familysearch.org and then scroll down to browse the collections for the US. Under Tennessee you will find the Tennessee Probate Records collection. Click on that and then on Washington Co to see the records available. You will have to get an account (free) with FHC because the State of Tennessee requires that they do so as part of their policy for releasing these records for upload.
Be aware there are different unrelated Davidson lines found in most counties in that pocket of NC, VA, and Tenn.
Hope this helps.
Rgards, Sue Elfving