Robert Stewart was born about 1632, he was the second son of Andrew Stewart (2nd Baron Castle Stewart) & his wife Anne.
He died young.
Sources
The Heraldry of the Stewarts Page 34. by George Harvey Johnston.
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DNA Connections
It may be possible to confirm family relationships with Robert 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]