Prior to completing the merge of Case-546 (L) and Case-3295 (R) it would be nice to find primary sources regarding the Weygant relationship. Can you help?
"Find A Grave Index," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:QVGN-NW3S : 11 July 2016), Sarah Case Birdsall, 1820; Burial, , , ,, ; citing record ID 122356112, Find a Grave, http://www.findagrave.com. links to husband James and son David.
1800 census https://www.familysearch.org/ark:/61903/3:1:33SQ-GRZ5-BCR?i=2&cc=1804228 5 boys, 2 girls, 2 women 26-44.
http://prntscr.com/kxx4tn is a screenshot of the download of the source on 3295. red lines and arrows added for clarity. You MUST download the page to see it correctly.
Thanks for the look at! The Birdsall Book is lax on sourcing as is Find A Grave. She did survive James long enough to have married again. If we consider the transcriptions of Oblong MM to be correct; but, they do not match. With the book stating son of 1st marriage of father Nathan. There are many in NY with both surnames Case and Birdsall.
My gut feeling is these two profiles are a match; yet, starting with no evidence has me a bit shy of possibly conflating the profile. The Weygant name is likely the most uncommon name though there are many of those also in the area just west of the Hudson River in New York. The 1790 marriage does not fit at all... Before James died and after many children were born.
BTW: The screenshot opens without download.