Stewart 1
The only reference I have (attached) is an old hand written tree of Frank McDavid circa 1950. In it he writes:
‘a Gray of Schivas m but wife died prior to 1745. This Gray died of wounds at Culloden 1744 in army of Prince Charles Edward Stewart. M 1740. Bogie Laird of Towie.
The Gray of Schivas went to work for the laird of Auchintoul 1735 (?). After Culloden, Alexander Gray , 5 years old was left in the care of General Alexander Gordon, the Laird of Auchintoul who looked after and educated Alexander before the latter went to Forglen House. Alexander went to Forglen House where he met and married Jane Bogie and went to Marble Quarries where William and 2 sisters were born”. There appears to be a Gordon and Gray connection to Schivas estate predating John Gray, though the Gordons of Schivas appear to be of the Gordons of Huntley
You suggest Alexander’s father’s name as John Gray of, or working, at Muiresk nr Turriff.
And your proposal of Auchintoul at Aberchirder makes perfect sense. Though I am unsure of the reference to Foggie which is new to me. Laithers, I see, he acquired in 1712.
From his book of the History of Peter The Great:
https://archive.org/details/historypetergre00gordgoog/page/n14/mode/2up the Major General Alexander Gordon of Auchintoul was born the 27th of December 1669, eldest son of Alexander Gordon and Isobel Gray, daughter to Gray of Braik, brother to Lord Gray. His grandfather, George Gordon of Cocklarachie, bought Auchintoul. Descended from the Gordons of Craig.
“In the year 1699 or 1700, he married his friend General Patrick Gordon’s daughter, then the widow of Colonel Strashurgh, a German; by whom he had several children, who all died in their infancy.”
Returning from Russian military service “soon after his arrival in Scotland he caufed make an addition to his land, house of Achintoul; and in 1712 purchafed the barony of Laithers in Aberdeenshire.”
“From 1727 he returned to Scotland till 1739, when his lady died, he enjoyed all the happiness that results from a country retirement, an agreeable neighbourhood and universal respect. Sometime after his lady's death, he married Mrs, Margaret Moncrieff, eldeft daughter to Sir Thomas Moncrief of that ilk; with whom he lived very happily till the end of July 1752, when he died in the 82nd year of his age, of a tedious illness occasioned by the ftranguary and gravel. He was buried on the 5th of August in his father's burial-place at Marnochkirk; and left no issue by any of his wives.”
Returning to Scotland in 1739 when his wife died, a 75 year old war hero, with no surviving children, looking after the five year old son whose father had died in battle makes sense.