GO: Mary Ganly Grady

https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1897/05845/4655939.pdf

Thomas's mother (Michael's wife) Mary Ganly dies around 1897; her daughter Mary is present at death in Foxboro:

So, for 'our' generation, this was our great-great-grandmother.

Also, "70 years" must be wrong, given the birth years of some of Michael & Mary's children. Unless, of course, there were two Marys ...