Hi Benody,
She quotes the manuscript of Charles George Stuart (are you familiar with this?) and then points out that “proofs of the assertions made in the first part of it are, so far, not forthcoming”.
She mentions several William Stewarts involved in King William’s army, “but further investigation would appear to exclude them on one account or another.” Therefore there doesn’t seem to be any evidence of who Irwin Stuart’s grandfather was.
The father of Irwin Stewart was neither James nor Alexander, but Henry, and is so given in another “tree” compiled by the late Lieut. Irwin, and continued by his cousin Henry Irwin. Irwin Stewart, in his entry to Trinity College, Dublin, gives the name of his father as Henry.
A will of a Sarah Ormsby, dated 17--, mentions her grand-dau. Jane Stuart, and one of the witnesses of the will is “Hen: Stuart.” …
Gilby