Mary, I am looking for info on Mary Whann & her relationship to the Ross family. She is listed in the exerpt I have of the will you mention (1792, John Whann) as Mary Ross.
I believe she could have been married to a Joseph Ross of Londenderry Twp. who died around 1796. Mary then shows up in Londongrove in the 1800 census as head of household and by 1810 had moved to Centre Co. (still Ross, head of household).
Do you have any info on her or who her Ross husband was?