Possibly a twin to his brother William,
Archibald was Doctor of Medicine.
He died without issue
Sources
The Red Book of Grandtully. Page 242.
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DNA Connections
It may be possible to confirm family relationships with Archibald by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Basil Stewart :
AncestryDNA Paternal Lineage (discontinued) 47 markers, haplogroup R1b, Ancestry member BasilStewart, MitoYDNA ID A10718[compare]