Searching Scotlands People, https://www.scotlandspeople.gov.uk/ there is a marriage with Sarah McGregor, or at least Banns were callled at Callendar on 22 March 1787 with Alexander Stewart of Callendar, and Sarah McGregor of Salt Market, Glasgow.
There is another mention of this couple on 25 March 1787 at Glasgow and this seems to be when they were actually married. Alexander is described as Alex. Stewart, Farmer in Callendar Parish.
However I've been unable to find any children of this couple nor any marriage with Margaret Atheyn.
The fact that he is a farmer, may help find other sources of information but at the moment apart from the marriage to Sarah McGregor, nothing else about this profile can be confirmed.
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S > Stewart > Alexander Stewart
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